158404 has 9 divisors (see below), whose sum is σ = 278607. Its totient is φ = 78804.

The previous prime is 158393. The next prime is 158407. The reversal of 158404 is 404851.

158404 = T₃₉₇ + T₃₉₈.

The square root of 158404 is 398.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158407) by changing a digit.

158404 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 697 + ... + 895.

2¹⁵⁸⁴⁰⁴ is an apocalyptic number.

158404 is the 398-th square number.

It is an amenable number.

158404 is a deficient number, since it is larger than the sum of its proper divisors (120203).

158404 is an equidigital number, since it uses as much as digits as its factorization.

158404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402 (or 201 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The cubic root of 158404 is about 54.1072400204.

The spelling of 158404 in words is "one hundred fifty-eight thousand, four hundred four".