40442013 has 12 divisors (see below), whose sum is σ = 61491040. Its totient is φ = 25542216.

The previous prime is 40442009. The next prime is 40442057. The reversal of 40442013 is 31024404.

It is not a de Polignac number, because 40442013 - 2² = 40442009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40442063) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118081 + ... + 118422.

Almost surely, 2^40442013 is an apocalyptic number.

It is an amenable number.

40442013 is a deficient number, since it is larger than the sum of its proper divisors (21049027).

40442013 is a wasteful number, since it uses less digits than its factorization.

40442013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236528 (or 236525 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 40442013 is about 6359.4035097641. The cubic root of 40442013 is about 343.2502968406.

Adding to 40442013 its reverse (31024404), we get a palindrome (71466417).

The spelling of 40442013 in words is "forty million, four hundred forty-two thousand, thirteen".