1401323220 has 192 divisors, whose sum is σ = 4779129600. Its totient is φ = 338065920.

The previous prime is 1401323201. The next prime is 1401323221. The reversal of 1401323220 is 223231041.

It is a super-2 number, since 2×1401323220² = 3927413533822336800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1401323193 and 1401323202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1401323221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1597422 + ... + 1598298.

It is an arithmetic number, because the mean of its divisors is an integer number (24891300).

Almost surely, 2^1401323220 is an apocalyptic number.

1401323220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1401323220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2389564800).

1401323220 is an abundant number, since it is smaller than the sum of its proper divisors (3377806380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1401323220 is a wasteful number, since it uses less digits than its factorization.

1401323220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1175 (or 1167 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1401323220 is about 37434.2519626077. The cubic root of 1401323220 is about 1119.0412767156.

Adding to 1401323220 its reverse (223231041), we get a palindrome (1624554261).

The spelling of 1401323220 in words is "one billion, four hundred one million, three hundred twenty-three thousand, two hundred twenty".