79879381 has 4 divisors (see below), whose sum is σ = 79903692. Its totient is φ = 79855072.

The previous prime is 79879351. The next prime is 79879399. The reversal of 79879381 is 18397897.

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 54538225 + 25341156 = 7385^2 + 5034^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79879381 is a prime.

It is a super-2 number, since 2×79879381² = 12761431017886322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79879351) 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, 6280 + ... + 14113.

It is an arithmetic number, because the mean of its divisors is an integer number (19975923).

Almost surely, 2^79879381 is an apocalyptic number.

It is an amenable number.

79879381 is a deficient number, since it is larger than the sum of its proper divisors (24311).

79879381 is a wasteful number, since it uses less digits than its factorization.

79879381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24310.

The product of its digits is 762048, while the sum is 52.

The square root of 79879381 is about 8937.5265594011. The cubic root of 79879381 is about 430.6702742810.

The spelling of 79879381 in words is "seventy-nine million, eight hundred seventy-nine thousand, three hundred eighty-one".