157390385 has 4 divisors (see below), whose sum is σ = 188868468. Its totient is φ = 125912304.

The previous prime is 157390381. The next prime is 157390393. The reversal of 157390385 is 583093751.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 583093751 = 5021 ⋅116131.

It can be written as a sum of positive squares in 2 ways, for example, as 111598096 + 45792289 = 10564^2 + 6767^2 .

It is a cyclic number.

It is not a de Polignac number, because 157390385 - 2² = 157390381 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157390381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15739034 + ... + 15739043.

It is an arithmetic number, because the mean of its divisors is an integer number (47217117).

Almost surely, 2^157390385 is an apocalyptic number.

It is an amenable number.

157390385 is a deficient number, since it is larger than the sum of its proper divisors (31478083).

157390385 is an equidigital number, since it uses as much as digits as its factorization.

157390385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31478082.

The product of its (nonzero) digits is 113400, while the sum is 41.

The square root of 157390385 is about 12545.5324717606. The cubic root of 157390385 is about 539.9158362200.

The spelling of 157390385 in words is "one hundred fifty-seven million, three hundred ninety thousand, three hundred eighty-five".