40442431 has 4 divisors (see below), whose sum is σ = 42571000. Its totient is φ = 38313864.

The previous prime is 40442429. The next prime is 40442447. The reversal of 40442431 is 13424404.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40442431 - 2¹ = 40442429 is a prime.

It is a super-2 number, since 2×40442431² = 3271180450379522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40442411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1064256 + ... + 1064293.

It is an arithmetic number, because the mean of its divisors is an integer number (10642750).

Almost surely, 2^40442431 is an apocalyptic number.

40442431 is a deficient number, since it is larger than the sum of its proper divisors (2128569).

40442431 is a wasteful number, since it uses less digits than its factorization.

40442431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2128568.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 40442431 is about 6359.4363743967. The cubic root of 40442431 is about 343.2514794238.

Adding to 40442431 its reverse (13424404), we get a palindrome (53866835).

The spelling of 40442431 in words is "forty million, four hundred forty-two thousand, four hundred thirty-one".