158421556 has 12 divisors (see below), whose sum is σ = 277412800. Its totient is φ = 79160760.

The previous prime is 158421547. The next prime is 158421559. The reversal of 158421556 is 655124851.

It is a super-2 number, since 2×158421556² = 50194778810922272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158421559) 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, 4860 + ... + 18451.

Almost surely, 2^158421556 is an apocalyptic number.

It is an amenable number.

158421556 is a deficient number, since it is larger than the sum of its proper divisors (118991244).

158421556 is a wasteful number, since it uses less digits than its factorization.

158421556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25014 (or 25012 counting only the distinct ones).

The product of its digits is 48000, while the sum is 37.

The square root of 158421556 is about 12586.5625172245. The cubic root of 158421556 is about 541.0923885799.

The spelling of 158421556 in words is "one hundred fifty-eight million, four hundred twenty-one thousand, five hundred fifty-six".