42079815 has 12 divisors (see below), whose sum is σ = 72938424. Its totient is φ = 22442544.

The previous prime is 42079789. The next prime is 42079837. The reversal of 42079815 is 51897024.

It is not a de Polignac number, because 42079815 - 2²⁰ = 41031239 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 42079815.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 467509 + ... + 467598.

It is an arithmetic number, because the mean of its divisors is an integer number (6078202).

Almost surely, 2^42079815 is an apocalyptic number.

42079815 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

42079815 is a deficient number, since it is larger than the sum of its proper divisors (30858609).

42079815 is a wasteful number, since it uses less digits than its factorization.

42079815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935118 (or 935115 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 42079815 is about 6486.8956365892. The cubic root of 42079815 is about 347.8227148914.

The spelling of 42079815 in words is "forty-two million, seventy-nine thousand, eight hundred fifteen".