156909986 has 8 divisors (see below), whose sum is σ = 236665884. Its totient is φ = 78021360.

The previous prime is 156909971. The next prime is 156910009. The reversal of 156909986 is 689909651.

It can be written as a sum of positive squares in 2 ways, for example, as 143256961 + 13653025 = 11969^2 + 3695^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 216365 + ... + 217088.

Almost surely, 2^156909986 is an apocalyptic number.

156909986 is a deficient number, since it is larger than the sum of its proper divisors (79755898).

156909986 is a wasteful number, since it uses less digits than its factorization.

156909986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433636.

The product of its (nonzero) digits is 1049760, while the sum is 53.

The square root of 156909986 is about 12526.3716215032. The cubic root of 156909986 is about 539.3659522039.

The spelling of 156909986 in words is "one hundred fifty-six million, nine hundred nine thousand, nine hundred eighty-six".