156729921 has 8 divisors (see below), whose sum is σ = 214070304. Its totient is φ = 101938080.

The previous prime is 156729899. The next prime is 156729929. The reversal of 156729921 is 129927651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 156729921 - 2¹⁸ = 156467777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (156729929) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 636991 + ... + 637236.

It is an arithmetic number, because the mean of its divisors is an integer number (26758788).

Almost surely, 2^156729921 is an apocalyptic number.

It is an amenable number.

156729921 is a deficient number, since it is larger than the sum of its proper divisors (57340383).

156729921 is a wasteful number, since it uses less digits than its factorization.

156729921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1274271.

The product of its digits is 68040, while the sum is 42.

The square root of 156729921 is about 12519.1821218481. The cubic root of 156729921 is about 539.1595533903.

The spelling of 156729921 in words is "one hundred fifty-six million, seven hundred twenty-nine thousand, nine hundred twenty-one".