639711 has 32 divisors (see below), whose sum is σ = 1056000. Its totient is φ = 381024.

The previous prime is 639703. The next prime is 639713. The reversal of 639711 is 117936.

It is not a de Polignac number, because 639711 - 2³ = 639703 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639713) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14856 + ... + 14898.

It is an arithmetic number, because the mean of its divisors is an integer number (33000).

2⁶³⁹⁷¹¹ is an apocalyptic number.

639711 is a deficient number, since it is larger than the sum of its proper divisors (416289).

639711 is a wasteful number, since it uses less digits than its factorization.

639711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100 (or 94 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The square root of 639711 is about 799.8193546045. The cubic root of 639711 is about 86.1644141561.

The spelling of 639711 in words is "six hundred thirty-nine thousand, seven hundred eleven".