79957 has 4 divisors (see below), whose sum is σ = 82156. Its totient is φ = 77760.

The previous prime is 79943. The next prime is 79967. The reversal of 79957 is 75997.

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

It can be written as a sum of positive squares in 2 ways, for example, as 62001 + 17956 = 249^2 + 134^2 .

It is a cyclic number.

It is not a de Polignac number, because 79957 - 2⁷ = 79829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 2161 = 79957 / (7 + 9 + 9 + 5 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79907) 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, 1044 + ... + 1117.

It is an arithmetic number, because the mean of its divisors is an integer number (20539).

2⁷⁹⁹⁵⁷ is an apocalyptic number.

It is an amenable number.

79957 is a deficient number, since it is larger than the sum of its proper divisors (2199).

79957 is a wasteful number, since it uses less digits than its factorization.

79957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2198.

The product of its digits is 19845, while the sum is 37.

The square root of 79957 is about 282.7666882785. The cubic root of 79957 is about 43.0809723594.

The spelling of 79957 in words is "seventy-nine thousand, nine hundred fifty-seven".