639113400 has 72 divisors (see below), whose sum is σ = 2146361880. Its totient is φ = 170429760.

The previous prime is 639113369. The next prime is 639113401. The reversal of 639113400 is 4311936.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639113401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 175732 + ... + 179331.

Almost surely, 2^639113400 is an apocalyptic number.

639113400 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

639113400 is an abundant number, since it is smaller than the sum of its proper divisors (1507248480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639113400 is a wasteful number, since it uses less digits than its factorization.

639113400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355085 (or 355073 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 639113400 is about 25280.6922373577. The cubic root of 639113400 is about 861.3757500723.

It can be divided in two parts, 6391 and 13400, that added together give a palindrome (19791).

The spelling of 639113400 in words is "six hundred thirty-nine million, one hundred thirteen thousand, four hundred".