639374416 has 10 divisors (see below), whose sum is σ = 1238787962. Its totient is φ = 319687200.

The previous prime is 639374381. The next prime is 639374419. The reversal of 639374416 is 614473936.

It can be written as a sum of positive squares in only one way, i.e., 361152016 + 278222400 = 19004^2 + 16680^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639374419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19980435 + ... + 19980466.

Almost surely, 2^639374416 is an apocalyptic number.

It is an amenable number.

639374416 is a deficient number, since it is larger than the sum of its proper divisors (599413546).

639374416 is a wasteful number, since it uses less digits than its factorization.

639374416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39960909 (or 39960903 counting only the distinct ones).

The product of its digits is 326592, while the sum is 43.

The square root of 639374416 is about 25285.8540690244. The cubic root of 639374416 is about 861.4929970023.

The spelling of 639374416 in words is "six hundred thirty-nine million, three hundred seventy-four thousand, four hundred sixteen".