638301987 has 12 divisors (see below), whose sum is σ = 937107184. Its totient is φ = 418558320.

The previous prime is 638301967. The next prime is 638301991. The reversal of 638301987 is 789103836.

It is a happy number.

638301987 is a `hidden beast` number, since 638 + 3 + 0 + 1 + 9 + 8 + 7 = 666.

638301987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 638301987 - 2⁸ = 638301731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638301967) 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, 580783 + ... + 581880.

Almost surely, 2^638301987 is an apocalyptic number.

638301987 is a deficient number, since it is larger than the sum of its proper divisors (298805197).

638301987 is a wasteful number, since it uses less digits than its factorization.

638301987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162730 (or 1162727 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 638301987 is about 25264.6390633233. The cubic root of 638301987 is about 861.0110638908.

The spelling of 638301987 in words is "six hundred thirty-eight million, three hundred one thousand, nine hundred eighty-seven".