158657138 has 4 divisors (see below), whose sum is σ = 237985710. Its totient is φ = 79328568.

The previous prime is 158657131. The next prime is 158657153. The reversal of 158657138 is 831756851.

158657138 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831756851 = 18787 ⋅44273.

It can be written as a sum of positive squares in only one way, i.e., 129572689 + 29084449 = 11383^2 + 5393^2 .

It is not an unprimeable number, because it can be changed into a prime (158657131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39664283 + ... + 39664286.

Almost surely, 2^158657138 is an apocalyptic number.

158657138 is a deficient number, since it is larger than the sum of its proper divisors (79328572).

158657138 is an equidigital number, since it uses as much as digits as its factorization.

158657138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79328571.

The product of its digits is 201600, while the sum is 44.

The square root of 158657138 is about 12595.9175132263. The cubic root of 158657138 is about 541.3604676144.

The spelling of 158657138 in words is "one hundred fifty-eight million, six hundred fifty-seven thousand, one hundred thirty-eight".