40640663 has 4 divisors (see below), whose sum is σ = 46446480. Its totient is φ = 34834848.

The previous prime is 40640657. The next prime is 40640669. The reversal of 40640663 is 36604604.

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

It is an interprime number because it is at equal distance from previous prime (40640657) and next prime (40640669).

It is a cyclic number.

It is not a de Polignac number, because 40640663 - 2⁴ = 40640647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40640669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2902898 + ... + 2902911.

It is an arithmetic number, because the mean of its divisors is an integer number (11611620).

Almost surely, 2^40640663 is an apocalyptic number.

40640663 is a deficient number, since it is larger than the sum of its proper divisors (5805817).

40640663 is an equidigital number, since it uses as much as digits as its factorization.

40640663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5805816.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 40640663 is about 6375.0029803915. The cubic root of 40640663 is about 343.8113909968.

The spelling of 40640663 in words is "forty million, six hundred forty thousand, six hundred sixty-three".