158831638 has 16 divisors (see below), whose sum is σ = 277840800. Its totient is φ = 68070408.

The previous prime is 158831627. The next prime is 158831653. The reversal of 158831638 is 836138851.

158831638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 158831594 and 158831603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115081 + ... + 116452.

It is an arithmetic number, because the mean of its divisors is an integer number (17365050).

Almost surely, 2^158831638 is an apocalyptic number.

158831638 is a deficient number, since it is larger than the sum of its proper divisors (119009162).

158831638 is an equidigital number, since it uses as much as digits as its factorization.

158831638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231556 (or 231542 counting only the distinct ones).

The product of its digits is 138240, while the sum is 43.

The square root of 158831638 is about 12602.8424571602. The cubic root of 158831638 is about 541.5588677419.

The spelling of 158831638 in words is "one hundred fifty-eight million, eight hundred thirty-one thousand, six hundred thirty-eight".