157992009 has 16 divisors (see below), whose sum is σ = 243090432. Its totient is φ = 89403408.

The previous prime is 157991959. The next prime is 157992031. The reversal of 157992009 is 900299751.

It is not a de Polignac number, because 157992009 - 2⁷ = 157991881 is a prime.

It is a super-2 number, since 2×157992009² = 49922949815712162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (157992209) 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, 34359 + ... + 38684.

It is an arithmetic number, because the mean of its divisors is an integer number (15193152).

Almost surely, 2^157992009 is an apocalyptic number.

It is an amenable number.

157992009 is a deficient number, since it is larger than the sum of its proper divisors (85098423).

157992009 is a wasteful number, since it uses less digits than its factorization.

157992009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73156.

The product of its (nonzero) digits is 51030, while the sum is 42.

The square root of 157992009 is about 12569.4872210445. The cubic root of 157992009 is about 540.6029034327.

The spelling of 157992009 in words is "one hundred fifty-seven million, nine hundred ninety-two thousand, nine".