156409402 has 16 divisors (see below), whose sum is σ = 237286440. Its totient is φ = 77317632.

The previous prime is 156409391. The next prime is 156409403. The reversal of 156409402 is 204904651.

156409402 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 9054081 + 147355321 = 3009^2 + 12139^2 .

It is not an unprimeable number, because it can be changed into a prime (156409403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137974 + ... + 139102.

Almost surely, 2^156409402 is an apocalyptic number.

156409402 is a deficient number, since it is larger than the sum of its proper divisors (80877038).

156409402 is a wasteful number, since it uses less digits than its factorization.

156409402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1857.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 156409402 is about 12506.3744546531. The cubic root of 156409402 is about 538.7917682315.

The spelling of 156409402 in words is "one hundred fifty-six million, four hundred nine thousand, four hundred two".