42709815 has 32 divisors (see below), whose sum is σ = 79929600. Its totient is φ = 21578400.

The previous prime is 42709813. The next prime is 42709829. The reversal of 42709815 is 51890724.

It is not a de Polignac number, because 42709815 - 2¹ = 42709813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42709815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42709811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5761 + ... + 10890.

It is an arithmetic number, because the mean of its divisors is an integer number (2497800).

Almost surely, 2^42709815 is an apocalyptic number.

42709815 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

42709815 is a deficient number, since it is larger than the sum of its proper divisors (37219785).

42709815 is a wasteful number, since it uses less digits than its factorization.

42709815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16684 (or 16678 counting only the distinct ones).

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

The square root of 42709815 is about 6535.2746690556. The cubic root of 42709815 is about 349.5499385253.

The spelling of 42709815 in words is "forty-two million, seven hundred nine thousand, eight hundred fifteen".