40638638 has 8 divisors (see below), whose sum is σ = 61014288. Its totient is φ = 20300544.

The previous prime is 40638629. The next prime is 40638673. The reversal of 40638638 is 83683604.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6506 + ... + 11117.

It is an arithmetic number, because the mean of its divisors is an integer number (7626786).

Almost surely, 2^40638638 is an apocalyptic number.

40638638 is a deficient number, since it is larger than the sum of its proper divisors (20375650).

40638638 is a wasteful number, since it uses less digits than its factorization.

40638638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18778.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 40638638 is about 6374.8441549578. The cubic root of 40638638 is about 343.8056805451.

The spelling of 40638638 in words is "forty million, six hundred thirty-eight thousand, six hundred thirty-eight".