40605639 has 8 divisors (see below), whose sum is σ = 57325680. Its totient is φ = 25478016.

The previous prime is 40605623. The next prime is 40605647. The reversal of 40605639 is 93650604.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40605639 - 2⁴ = 40605623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40605619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 398044 + ... + 398145.

It is an arithmetic number, because the mean of its divisors is an integer number (7165710).

Almost surely, 2^40605639 is an apocalyptic number.

40605639 is a deficient number, since it is larger than the sum of its proper divisors (16720041).

40605639 is a wasteful number, since it uses less digits than its factorization.

40605639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796209.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 40605639 is about 6372.2554091938. The cubic root of 40605639 is about 343.7125974070.

The spelling of 40605639 in words is "forty million, six hundred five thousand, six hundred thirty-nine".