638842701 has 16 divisors (see below), whose sum is σ = 996114944. Its totient is φ = 356562864.

The previous prime is 638842697. The next prime is 638842709. The reversal of 638842701 is 107248836.

It is not a de Polignac number, because 638842701 - 2² = 638842697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 638842701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638842709) 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 15 ways as a sum of consecutive naturals, for example, 352831 + ... + 354636.

It is an arithmetic number, because the mean of its divisors is an integer number (62257184).

Almost surely, 2^638842701 is an apocalyptic number.

It is an amenable number.

638842701 is a deficient number, since it is larger than the sum of its proper divisors (357272243).

638842701 is a wasteful number, since it uses less digits than its factorization.

638842701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707520.

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 638842701 is about 25275.3378018969. The cubic root of 638842701 is about 861.2541198669.

The spelling of 638842701 in words is "six hundred thirty-eight million, eight hundred forty-two thousand, seven hundred one".