156693489 has 16 divisors (see below), whose sum is σ = 212981760. Its totient is φ = 102453120.

The previous prime is 156693469. The next prime is 156693491. The reversal of 156693489 is 984396651.

It is a de Polignac number, because none of the positive numbers 2^k-156693489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (156693469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31599 + ... + 36219.

It is an arithmetic number, because the mean of its divisors is an integer number (13311360).

Almost surely, 2^156693489 is an apocalyptic number.

It is an amenable number.

156693489 is a deficient number, since it is larger than the sum of its proper divisors (56288271).

156693489 is a wasteful number, since it uses less digits than its factorization.

156693489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4840.

The product of its digits is 1399680, while the sum is 51.

The square root of 156693489 is about 12517.7269901528. The cubic root of 156693489 is about 539.1177741246.

The spelling of 156693489 in words is "one hundred fifty-six million, six hundred ninety-three thousand, four hundred eighty-nine".