79815942 has 40 divisors (see below), whose sum is σ = 180259992. Its totient is φ = 26395200.

The previous prime is 79815913. The next prime is 79815943. The reversal of 79815942 is 24951897.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79815943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 19342 + ... + 23102.

Almost surely, 2^79815942 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79815942, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90129996).

79815942 is an abundant number, since it is smaller than the sum of its proper divisors (100444050).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

79815942 is a wasteful number, since it uses less digits than its factorization.

79815942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3906 (or 3897 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 79815942 is about 8933.9768300573. The cubic root of 79815942 is about 430.5562334730.

The spelling of 79815942 in words is "seventy-nine million, eight hundred fifteen thousand, nine hundred forty-two".