157979 has 4 divisors (see below), whose sum is σ = 158880. Its totient is φ = 157080.

The previous prime is 157951. The next prime is 157991. The reversal of 157979 is 979751.

157979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 979751 = 541 ⋅1811.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157999) 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, 92 + ... + 569.

It is an arithmetic number, because the mean of its divisors is an integer number (39720).

2¹⁵⁷⁹⁷⁹ is an apocalyptic number.

157979 is a deficient number, since it is larger than the sum of its proper divisors (901).

157979 is an equidigital number, since it uses as much as digits as its factorization.

157979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900.

The product of its digits is 19845, while the sum is 38.

The square root of 157979 is about 397.4657217925. The cubic root of 157979 is about 54.0588065348.

The spelling of 157979 in words is "one hundred fifty-seven thousand, nine hundred seventy-nine".