639485 has 24 divisors (see below), whose sum is σ = 970368. Its totient is φ = 396000.

The previous prime is 639451. The next prime is 639487. The reversal of 639485 is 584936.

It is not a de Polignac number, because 639485 - 2¹² = 635389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639487) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4160 + ... + 4310.

It is an arithmetic number, because the mean of its divisors is an integer number (40432).

2⁶³⁹⁴⁸⁵ is an apocalyptic number.

It is an amenable number.

639485 is a deficient number, since it is larger than the sum of its proper divisors (330883).

639485 is a wasteful number, since it uses less digits than its factorization.

639485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185 (or 174 counting only the distinct ones).

The product of its digits is 25920, while the sum is 35.

The square root of 639485 is about 799.6780602217. The cubic root of 639485 is about 86.1542661094.

The spelling of 639485 in words is "six hundred thirty-nine thousand, four hundred eighty-five".