40638399 has 8 divisors (see below), whose sum is σ = 54254592. Its totient is φ = 27057240.

The previous prime is 40638373. The next prime is 40638413. The reversal of 40638399 is 99383604.

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

It is a de Polignac number, because none of the positive numbers 2^k-40638399 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40638399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40638329) 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, 5919 + ... + 10784.

It is an arithmetic number, because the mean of its divisors is an integer number (6781824).

Almost surely, 2^40638399 is an apocalyptic number.

40638399 is a deficient number, since it is larger than the sum of its proper divisors (13616193).

40638399 is a wasteful number, since it uses less digits than its factorization.

40638399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17517.

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 40638399 is about 6374.8254093740. The cubic root of 40638399 is about 343.8050065583.

The spelling of 40638399 in words is "forty million, six hundred thirty-eight thousand, three hundred ninety-nine".