40639491 has 12 divisors (see below), whose sum is σ = 58839768. Its totient is φ = 27029184.

The previous prime is 40639463. The next prime is 40639507. The reversal of 40639491 is 19493604.

It is not a de Polignac number, because 40639491 - 2⁷ = 40639363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40639441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1110 + ... + 9083.

It is an arithmetic number, because the mean of its divisors is an integer number (4903314).

Almost surely, 2^40639491 is an apocalyptic number.

40639491 is a deficient number, since it is larger than the sum of its proper divisors (18200277).

40639491 is a wasteful number, since it uses less digits than its factorization.

40639491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10642 (or 10639 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 40639491 is about 6374.9110582031. The cubic root of 40639491 is about 343.8080860079.

The spelling of 40639491 in words is "forty million, six hundred thirty-nine thousand, four hundred ninety-one".