158639 has 4 divisors (see below), whose sum is σ = 170856. Its totient is φ = 146424.

The previous prime is 158633. The next prime is 158647. The reversal of 158639 is 936851.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 158639 - 2¹² = 154543 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158633) 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, 6089 + ... + 6114.

It is an arithmetic number, because the mean of its divisors is an integer number (42714).

2¹⁵⁸⁶³⁹ is an apocalyptic number.

158639 is a deficient number, since it is larger than the sum of its proper divisors (12217).

158639 is a wasteful number, since it uses less digits than its factorization.

158639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12216.

The product of its digits is 6480, while the sum is 32.

The square root of 158639 is about 398.2951167162. The cubic root of 158639 is about 54.1339837026.

It can be divided in two parts, 158 and 639, that added together give a palindrome (797).

The spelling of 158639 in words is "one hundred fifty-eight thousand, six hundred thirty-nine".