157309407 has 24 divisors (see below), whose sum is σ = 235184768. Its totient is φ = 101217600.

The previous prime is 157309403. The next prime is 157309421. The reversal of 157309407 is 704903751.

It is a happy number.

It is not a de Polignac number, because 157309407 - 2² = 157309403 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157309403) 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, 183993 + ... + 184845.

Almost surely, 2^157309407 is an apocalyptic number.

157309407 is a deficient number, since it is larger than the sum of its proper divisors (77875361).

157309407 is a wasteful number, since it uses less digits than its factorization.

157309407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1551 (or 1548 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 157309407 is about 12542.3046925196. The cubic root of 157309407 is about 539.8232240294.

The spelling of 157309407 in words is "one hundred fifty-seven million, three hundred nine thousand, four hundred seven".