42556731 has 16 divisors (see below), whose sum is σ = 64940544. Its totient is φ = 24283584.

The previous prime is 42556699. The next prime is 42556733. The reversal of 42556731 is 13765524.

It is not a de Polignac number, because 42556731 - 2⁵ = 42556699 is a prime.

It is a super-3 number, since 3×42556731³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 42556692 and 42556701.

It is not an unprimeable number, because it can be changed into a prime (42556733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24855 + ... + 26511.

It is an arithmetic number, because the mean of its divisors is an integer number (4058784).

Almost surely, 2^42556731 is an apocalyptic number.

42556731 is a deficient number, since it is larger than the sum of its proper divisors (22383813).

42556731 is a wasteful number, since it uses less digits than its factorization.

42556731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2890.

The product of its digits is 25200, while the sum is 33.

The square root of 42556731 is about 6523.5520232462. The cubic root of 42556731 is about 349.1318101035.

The spelling of 42556731 in words is "forty-two million, five hundred fifty-six thousand, seven hundred thirty-one".