638377199 has 8 divisors (see below), whose sum is σ = 642878208. Its totient is φ = 633888640.

The previous prime is 638377193. The next prime is 638377231. The reversal of 638377199 is 991773836.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638377199 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 638377199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638377193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115139 + ... + 120555.

It is an arithmetic number, because the mean of its divisors is an integer number (80359776).

Almost surely, 2^638377199 is an apocalyptic number.

638377199 is a deficient number, since it is larger than the sum of its proper divisors (4501009).

638377199 is a wasteful number, since it uses less digits than its factorization.

638377199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6225.

The product of its digits is 1714608, while the sum is 53.

The square root of 638377199 is about 25266.1275030425. The cubic root of 638377199 is about 861.0448806015.

The spelling of 638377199 in words is "six hundred thirty-eight million, three hundred seventy-seven thousand, one hundred ninety-nine".