157942809 has 24 divisors (see below), whose sum is σ = 233513280. Its totient is φ = 102833952.

The previous prime is 157942793. The next prime is 157942819. The reversal of 157942809 is 908249751.

It is not a de Polignac number, because 157942809 - 2⁴ = 157942793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (157942819) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 124822 + ... + 126080.

It is an arithmetic number, because the mean of its divisors is an integer number (9729720).

Almost surely, 2^157942809 is an apocalyptic number.

It is an amenable number.

157942809 is a deficient number, since it is larger than the sum of its proper divisors (75570471).

157942809 is a wasteful number, since it uses less digits than its factorization.

157942809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1581 (or 1578 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 157942809 is about 12567.5299482436. The cubic root of 157942809 is about 540.5467815558.

The spelling of 157942809 in words is "one hundred fifty-seven million, nine hundred forty-two thousand, eight hundred nine".