40640667 has 4 divisors (see below), whose sum is σ = 54187560. Its totient is φ = 27093776.

The previous prime is 40640657. The next prime is 40640669. The reversal of 40640667 is 76604604.

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

It is a cyclic number.

It is not a de Polignac number, because 40640667 - 2⁶ = 40640603 is a prime.

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, 6773442 + ... + 6773447.

It is an arithmetic number, because the mean of its divisors is an integer number (13546890).

Almost surely, 2^40640667 is an apocalyptic number.

40640667 is a deficient number, since it is larger than the sum of its proper divisors (13546893).

40640667 is a wasteful number, since it uses less digits than its factorization.

40640667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13546892.

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 40640667 is about 6375.0032941168. The cubic root of 40640667 is about 343.8114022766.

The spelling of 40640667 in words is "forty million, six hundred forty thousand, six hundred sixty-seven".