42040644 has 24 divisors (see below), whose sum is σ = 99068928. Its totient is φ = 13874400.

The previous prime is 42040637. The next prime is 42040667. The reversal of 42040644 is 44604024.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16132 + ... + 18555.

It is an arithmetic number, because the mean of its divisors is an integer number (4127872).

Almost surely, 2^42040644 is an apocalyptic number.

It is an amenable number.

42040644 is an abundant number, since it is smaller than the sum of its proper divisors (57028284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42040644 is a wasteful number, since it uses less digits than its factorization.

42040644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34795 (or 34793 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 42040644 is about 6483.8756928245. The cubic root of 42040644 is about 347.7147550273.

Adding to 42040644 its reverse (44604024), we get a palindrome (86644668).

The spelling of 42040644 in words is "forty-two million, forty thousand, six hundred forty-four".