40642408 has 8 divisors (see below), whose sum is σ = 76204530. Its totient is φ = 20321200.

The previous prime is 40642397. The next prime is 40642411. The reversal of 40642408 is 80424604.

It can be written as a sum of positive squares in only one way, i.e., 30669444 + 9972964 = 5538^2 + 3158^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2540143 + ... + 2540158.

Almost surely, 2^40642408 is an apocalyptic number.

It is an amenable number.

40642408 is a deficient number, since it is larger than the sum of its proper divisors (35562122).

40642408 is a wasteful number, since it uses less digits than its factorization.

40642408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5080307 (or 5080303 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

The square root of 40642408 is about 6375.1398416035. The cubic root of 40642408 is about 343.8163117031.

The spelling of 40642408 in words is "forty million, six hundred forty-two thousand, four hundred eight".