40640505 has 16 divisors (see below), whose sum is σ = 65116224. Its totient is φ = 21644480.

The previous prime is 40640497. The next prime is 40640507. The reversal of 40640505 is 50504604.

It is not a de Polignac number, because 40640505 - 2³ = 40640497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40640507) 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, 12775 + ... + 15635.

It is an arithmetic number, because the mean of its divisors is an integer number (4069764).

Almost surely, 2^40640505 is an apocalyptic number.

It is an amenable number.

40640505 is a deficient number, since it is larger than the sum of its proper divisors (24475719).

40640505 is a wasteful number, since it uses less digits than its factorization.

40640505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3816.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 40640505 is about 6374.9905882283. The cubic root of 40640505 is about 343.8109454474.

The spelling of 40640505 in words is "forty million, six hundred forty thousand, five hundred five".