158538132 has 18 divisors (see below), whose sum is σ = 400749258. Its totient is φ = 52846032.

The previous prime is 158538089. The next prime is 158538137. The reversal of 158538132 is 231835851.

It can be written as a sum of positive squares in only one way, i.e., 156650256 + 1887876 = 12516^2 + 1374^2 .

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: 4403837 = 158538132 / (1 + 5 + 8 + 5 + 3 + 8 + 1 + 3 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158538137) 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, 2201883 + ... + 2201954.

Almost surely, 2^158538132 is an apocalyptic number.

158538132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

158538132 is an abundant number, since it is smaller than the sum of its proper divisors (242211126).

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

158538132 is a wasteful number, since it uses less digits than its factorization.

158538132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4403847 (or 4403842 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 158538132 is about 12591.1926361247. The cubic root of 158538132 is about 541.2250786883.

The spelling of 158538132 in words is "one hundred fifty-eight million, five hundred thirty-eight thousand, one hundred thirty-two".