79420157 has 4 divisors (see below), whose sum is σ = 81357276. Its totient is φ = 77483040.

The previous prime is 79420153. The next prime is 79420181. The reversal of 79420157 is 75102497.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75102497 = 19 ⋅3952763.

It can be written as a sum of positive squares in 2 ways, for example, as 13388281 + 66031876 = 3659^2 + 8126^2 .

It is a cyclic number.

It is not a de Polignac number, because 79420157 - 2² = 79420153 is a prime.

It is a super-2 number, since 2×79420157² = 12615122675809298, 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 (79420153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 968498 + ... + 968579.

It is an arithmetic number, because the mean of its divisors is an integer number (20339319).

Almost surely, 2^79420157 is an apocalyptic number.

It is an amenable number.

79420157 is a deficient number, since it is larger than the sum of its proper divisors (1937119).

79420157 is a wasteful number, since it uses less digits than its factorization.

79420157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1937118.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 79420157 is about 8911.7987522161. The cubic root of 79420157 is about 429.8433844640.

The spelling of 79420157 in words is "seventy-nine million, four hundred twenty thousand, one hundred fifty-seven".