40140639 has 24 divisors (see below), whose sum is σ = 72289152. Its totient is φ = 20851920.

The previous prime is 40140601. The next prime is 40140641. The reversal of 40140639 is 93604104.

It is not a de Polignac number, because 40140639 - 2⁷ = 40140511 is a prime.

It is a super-2 number, since 2×40140639² = 3222541798656642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40140649) 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 23 ways as a sum of consecutive naturals, for example, 28269 + ... + 29654.

It is an arithmetic number, because the mean of its divisors is an integer number (3012048).

Almost surely, 2^40140639 is an apocalyptic number.

40140639 is a deficient number, since it is larger than the sum of its proper divisors (32148513).

40140639 is a wasteful number, since it uses less digits than its factorization.

40140639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57947 (or 57944 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 40140639 is about 6335.6640535938. The cubic root of 40140639 is about 342.3955360103.

The spelling of 40140639 in words is "forty million, one hundred forty thousand, six hundred thirty-nine".