158724 has 18 divisors (see below), whose sum is σ = 401310. Its totient is φ = 52896.

The previous prime is 158699. The next prime is 158731. The reversal of 158724 is 427851.

It can be written as a sum of positive squares in only one way, i.e., 101124 + 57600 = 318^2 + 240^2 .

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

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 158724.

It is an unprimeable number.

158724 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 5 ways as a sum of consecutive naturals, for example, 2169 + ... + 2240.

It is an arithmetic number, because the mean of its divisors is an integer number (22295).

2¹⁵⁸⁷²⁴ is an apocalyptic number.

It is an amenable number.

158724 is an abundant number, since it is smaller than the sum of its proper divisors (242586).

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

158724 is a wasteful number, since it uses less digits than its factorization.

158724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4419 (or 4414 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 158724 is about 398.4018072248. The cubic root of 158724 is about 54.1436504450.

It can be divided in two parts, 15872 and 4, that added together give a square (15876 = 126²).

The spelling of 158724 in words is "one hundred fifty-eight thousand, seven hundred twenty-four".