639900711 has 12 divisors (see below), whose sum is σ = 936002080. Its totient is φ = 421200000.

The previous prime is 639900661. The next prime is 639900739. The reversal of 639900711 is 117009936.

639900711 is a `hidden beast` number, since 639 + 9 + 0 + 0 + 7 + 11 = 666.

It is not a de Polignac number, because 639900711 - 2⁹ = 639900199 is a prime.

It is a super-3 number, since 3×639900711³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639900511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 449290 + ... + 450711.

Almost surely, 2^639900711 is an apocalyptic number.

639900711 is a deficient number, since it is larger than the sum of its proper divisors (296101369).

639900711 is a wasteful number, since it uses less digits than its factorization.

639900711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900086 (or 900083 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 639900711 is about 25296.2588340648. The cubic root of 639900711 is about 861.7293087776.

It can be divided in two parts, 639900 and 711, that multiplied together give a square (454968900 = 21330²).

The spelling of 639900711 in words is "six hundred thirty-nine million, nine hundred thousand, seven hundred eleven".