158213772 has 18 divisors (see below), whose sum is σ = 399929348. Its totient is φ = 52737912.

The previous prime is 158213753. The next prime is 158213777. The reversal of 158213772 is 277312851.

158213772 is a `hidden beast` number, since 1 + 582 + 1 + 3 + 7 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 4394827 = 158213772 / (1 + 5 + 8 + 2 + 1 + 3 + 7 + 7 + 2).

It is not an unprimeable number, because it can be changed into a prime (158213777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2197378 + ... + 2197449.

Almost surely, 2^158213772 is an apocalyptic number.

158213772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

158213772 is an abundant number, since it is smaller than the sum of its proper divisors (241715576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

158213772 is a wasteful number, since it uses less digits than its factorization.

158213772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4394837 (or 4394832 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 158213772 is about 12578.3056092623. The cubic root of 158213772 is about 540.8557214375.

The spelling of 158213772 in words is "one hundred fifty-eight million, two hundred thirteen thousand, seven hundred seventy-two".