1401433220 has 48 divisors (see below), whose sum is σ = 3218394816. Its totient is φ = 508368000.

The previous prime is 1401433139. The next prime is 1401433237. The reversal of 1401433220 is 223341041.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1401433192 and 1401433201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85055 + ... + 100185.

It is an arithmetic number, because the mean of its divisors is an integer number (67049892).

Almost surely, 2^1401433220 is an apocalyptic number.

1401433220 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 1401433220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1609197408).

1401433220 is an abundant number, since it is smaller than the sum of its proper divisors (1816961596).

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

1401433220 is a wasteful number, since it uses less digits than its factorization.

1401433220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15572 (or 15570 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1401433220 is about 37435.7211764379. The cubic root of 1401433220 is about 1119.0705564987.

Adding to 1401433220 its reverse (223341041), we get a palindrome (1624774261).

The spelling of 1401433220 in words is "one billion, four hundred one million, four hundred thirty-three thousand, two hundred twenty".