638792007 has 16 divisors (see below), whose sum is σ = 974176512. Its totient is φ = 364731840.

The previous prime is 638791999. The next prime is 638792009. The reversal of 638792007 is 700297836.

It is not a de Polignac number, because 638792007 - 2³ = 638791999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 638792007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638792009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16228 + ... + 39254.

It is an arithmetic number, because the mean of its divisors is an integer number (60886032).

Almost surely, 2^638792007 is an apocalyptic number.

638792007 is a deficient number, since it is larger than the sum of its proper divisors (335384505).

638792007 is a wasteful number, since it uses less digits than its factorization.

638792007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24358.

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 638792007 is about 25274.3349467399. The cubic root of 638792007 is about 861.2313382697.

The spelling of 638792007 in words is "six hundred thirty-eight million, seven hundred ninety-two thousand, seven".