638083965 has 16 divisors (see below), whose sum is σ = 1023179328. Its totient is φ = 339563136.

The previous prime is 638083961. The next prime is 638084003. The reversal of 638083965 is 569380836.

It is not a de Polignac number, because 638083965 - 2² = 638083961 is a prime.

It is a super-2 number, since 2×638083965² = 814302292780242450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638083961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39687 + ... + 53396.

It is an arithmetic number, because the mean of its divisors is an integer number (63948708).

Almost surely, 2^638083965 is an apocalyptic number.

It is an amenable number.

638083965 is a deficient number, since it is larger than the sum of its proper divisors (385095363).

638083965 is a wasteful number, since it uses less digits than its factorization.

638083965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93548.

The product of its (nonzero) digits is 933120, while the sum is 48.

The square root of 638083965 is about 25260.3239290394. The cubic root of 638083965 is about 860.9130221411.

The spelling of 638083965 in words is "six hundred thirty-eight million, eighty-three thousand, nine hundred sixty-five".