40290639 has 4 divisors (see below), whose sum is σ = 53720856. Its totient is φ = 26860424.

The previous prime is 40290619. The next prime is 40290647. The reversal of 40290639 is 93609204.

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 40290639 - 2⁷ = 40290511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40290619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6715104 + ... + 6715109.

It is an arithmetic number, because the mean of its divisors is an integer number (13430214).

Almost surely, 2^40290639 is an apocalyptic number.

40290639 is a deficient number, since it is larger than the sum of its proper divisors (13430217).

40290639 is a wasteful number, since it uses less digits than its factorization.

40290639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13430216.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 40290639 is about 6347.4907640736. The cubic root of 40290639 is about 342.8215007344.

The spelling of 40290639 in words is "forty million, two hundred ninety thousand, six hundred thirty-nine".