638960319 has 10 divisors (see below), whose sum is σ = 954496400. Its totient is φ = 425973492.

The previous prime is 638960303. The next prime is 638960417. The reversal of 638960319 is 913069836.

638960319 is a `hidden beast` number, since 6 + 38 + 9 + 603 + 1 + 9 = 666.

It is not a de Polignac number, because 638960319 - 2⁴ = 638960303 is a prime.

It is a super-4 number, since 4×638960319⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638960719) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3944119 + ... + 3944280.

It is an arithmetic number, because the mean of its divisors is an integer number (95449640).

Almost surely, 2^638960319 is an apocalyptic number.

638960319 is a deficient number, since it is larger than the sum of its proper divisors (315536081).

638960319 is an equidigital number, since it uses as much as digits as its factorization.

638960319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7888411 (or 7888402 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 638960319 is about 25277.6644292941. The cubic root of 638960319 is about 861.3069720900.

The spelling of 638960319 in words is "six hundred thirty-eight million, nine hundred sixty thousand, three hundred nineteen".