40640408 has 8 divisors (see below), whose sum is σ = 76200780. Its totient is φ = 20320200.

The previous prime is 40640399. The next prime is 40640417. The reversal of 40640408 is 80404604.

40640408 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (40640399) and next prime (40640417).

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

It is a super-3 number, since 3×40640408³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2540018 + ... + 2540033.

Almost surely, 2^40640408 is an apocalyptic number.

It is an amenable number.

40640408 is a deficient number, since it is larger than the sum of its proper divisors (35560372).

40640408 is a wasteful number, since it uses less digits than its factorization.

40640408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5080057 (or 5080053 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 40640408 is about 6374.9829803694. The cubic root of 40640408 is about 343.8106719134.

The spelling of 40640408 in words is "forty million, six hundred forty thousand, four hundred eight".