1422401220 has 144 divisors (see below), whose sum is σ = 4633469568. Its totient is φ = 351912960.

The previous prime is 1422401207. The next prime is 1422401221. The reversal of 1422401220 is 221042241.

1422401220 is a `hidden beast` number, since 1 + 42 + 2 + 401 + 220 = 666.

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 = 1422401193 and 1422401202.

It is not an unprimeable number, because it can be changed into a prime (1422401221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 213987 + ... + 220533.

It is an arithmetic number, because the mean of its divisors is an integer number (32176872).

Almost surely, 2^1422401220 is an apocalyptic number.

1422401220 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 1422401220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2316734784).

1422401220 is an abundant number, since it is smaller than the sum of its proper divisors (3211068348).

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

1422401220 is a wasteful number, since it uses less digits than its factorization.

1422401220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6650 (or 6645 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 1422401220 is about 37714.7347862874. The cubic root of 1422401220 is about 1124.6240640189.

Adding to 1422401220 its reverse (221042241), we get a palindrome (1643443461).

The spelling of 1422401220 in words is "one billion, four hundred twenty-two million, four hundred one thousand, two hundred twenty".