40402564 has 6 divisors (see below), whose sum is σ = 70704494. Its totient is φ = 20201280.

The previous prime is 40402561. The next prime is 40402603. The reversal of 40402564 is 46520404.

It can be written as a sum of positive squares in only one way, i.e., 38962564 + 1440000 = 6242^2 + 1200^2 .

It is not an unprimeable number, because it can be changed into a prime (40402561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5050317 + ... + 5050324.

Almost surely, 2^40402564 is an apocalyptic number.

It is an amenable number.

40402564 is a deficient number, since it is larger than the sum of its proper divisors (30301930).

40402564 is a wasteful number, since it uses less digits than its factorization.

40402564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10100645 (or 10100643 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 40402564 is about 6356.3011256548. The cubic root of 40402564 is about 343.1386531551.

Adding to 40402564 its reverse (46520404), we get a palindrome (86922968).

The spelling of 40402564 in words is "forty million, four hundred two thousand, five hundred sixty-four".