42538815 has 48 divisors (see below), whose sum is σ = 84689280. Its totient is φ = 19535040.

The previous prime is 42538759. The next prime is 42538817. The reversal of 42538815 is 51883524.

It is a happy number.

42538815 is a `hidden beast` number, since 42 + 538 + 81 + 5 = 666.

It is not a de Polignac number, because 42538815 - 2⁶ = 42538751 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42538815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42538817) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7144 + ... + 11666.

It is an arithmetic number, because the mean of its divisors is an integer number (1764360).

Almost surely, 2^42538815 is an apocalyptic number.

42538815 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

42538815 is a deficient number, since it is larger than the sum of its proper divisors (42150465).

42538815 is a wasteful number, since it uses less digits than its factorization.

42538815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4564 (or 4561 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 42538815 is about 6522.1787004037. The cubic root of 42538815 is about 349.0828094453.

The spelling of 42538815 in words is "forty-two million, five hundred thirty-eight thousand, eight hundred fifteen".