40008639 has 16 divisors (see below), whose sum is σ = 58423680. Its totient is φ = 24152160.

The previous prime is 40008637. The next prime is 40008643. The reversal of 40008639 is 93680004.

It is not a de Polignac number, because 40008639 - 2¹ = 40008637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40008637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6624 + ... + 11130.

It is an arithmetic number, because the mean of its divisors is an integer number (3651480).

Almost surely, 2^40008639 is an apocalyptic number.

40008639 is a deficient number, since it is larger than the sum of its proper divisors (18415041).

40008639 is a wasteful number, since it uses less digits than its factorization.

40008639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4790.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 40008639 is about 6325.2382563821. The cubic root of 40008639 is about 342.0198083667.

The spelling of 40008639 in words is "forty million, eight thousand, six hundred thirty-nine".