42531818 has 16 divisors (see below), whose sum is σ = 73008000. Its totient is φ = 18203856.

The previous prime is 42531809. The next prime is 42531887. The reversal of 42531818 is 81813524.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12683 + ... + 15681.

It is an arithmetic number, because the mean of its divisors is an integer number (4563000).

Almost surely, 2^42531818 is an apocalyptic number.

42531818 is a deficient number, since it is larger than the sum of its proper divisors (30476182).

42531818 is a wasteful number, since it uses less digits than its factorization.

42531818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4021.

The product of its digits is 7680, while the sum is 32.

The square root of 42531818 is about 6521.6422778316. The cubic root of 42531818 is about 349.0636687589.

The spelling of 42531818 in words is "forty-two million, five hundred thirty-one thousand, eight hundred eighteen".