156638412 has 72 divisors (see below), whose sum is σ = 467131392. Its totient is φ = 43308000.

The previous prime is 156638393. The next prime is 156638437. The reversal of 156638412 is 214836651.

It is a happy number.

156638412 is a `hidden beast` number, since 1 + 5 + 6 + 638 + 4 + 12 = 666.

It is a super-2 number, since 2×156638412² = 49071184227763488, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 2214 + ... + 17837.

It is an arithmetic number, because the mean of its divisors is an integer number (6487936).

Almost surely, 2^156638412 is an apocalyptic number.

156638412 is a gapful number since it is divisible by the number (12) 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 156638412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233565696).

156638412 is an abundant number, since it is smaller than the sum of its proper divisors (310492980).

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

156638412 is a wasteful number, since it uses less digits than its factorization.

156638412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20099 (or 20094 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 156638412 is about 12515.5268366937. The cubic root of 156638412 is about 539.0546009630.

The spelling of 156638412 in words is "one hundred fifty-six million, six hundred thirty-eight thousand, four hundred twelve".