156121620 has 48 divisors (see below), whose sum is σ = 439786368. Its totient is φ = 41380480.

The previous prime is 156121579. The next prime is 156121627. The reversal of 156121620 is 26121651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156121627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2230 + ... + 17810.

It is an arithmetic number, because the mean of its divisors is an integer number (9162216).

Almost surely, 2^156121620 is an apocalyptic number.

156121620 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 156121620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219893184).

156121620 is an abundant number, since it is smaller than the sum of its proper divisors (283664748).

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

156121620 is a wasteful number, since it uses less digits than its factorization.

156121620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15760 (or 15758 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 156121620 is about 12494.8637447553. The cubic root of 156121620 is about 538.4611193822.

The spelling of 156121620 in words is "one hundred fifty-six million, one hundred twenty-one thousand, six hundred twenty".