40639490 has 16 divisors (see below), whose sum is σ = 74708352. Its totient is φ = 15909744.

The previous prime is 40639463. The next prime is 40639507. The reversal of 40639490 is 9493604.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 40639490.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42764 + ... + 43703.

It is an arithmetic number, because the mean of its divisors is an integer number (4669272).

Almost surely, 2^40639490 is an apocalyptic number.

40639490 is a deficient number, since it is larger than the sum of its proper divisors (34068862).

40639490 is a wasteful number, since it uses less digits than its factorization.

40639490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86521.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 40639490 is about 6374.9109797706. The cubic root of 40639490 is about 343.8080831879.

The spelling of 40639490 in words is "forty million, six hundred thirty-nine thousand, four hundred ninety".