639254 has 24 divisors (see below), whose sum is σ = 1218888. Its totient is φ = 248640.

The previous prime is 639253. The next prime is 639257. The reversal of 639254 is 452936.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 639254.

It is not an unprimeable number, because it can be changed into a prime (639253) 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, 782 + ... + 1374.

It is an arithmetic number, because the mean of its divisors is an integer number (50787).

2⁶³⁹²⁵⁴ is an apocalyptic number.

639254 is a deficient number, since it is larger than the sum of its proper divisors (579634).

639254 is a wasteful number, since it uses less digits than its factorization.

639254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620 (or 613 counting only the distinct ones).

The product of its digits is 6480, while the sum is 29.

The square root of 639254 is about 799.5336140526. The cubic root of 639254 is about 86.1438910773.

It can be divided in two parts, 6392 and 54, that added together give a palindrome (6446).

The spelling of 639254 in words is "six hundred thirty-nine thousand, two hundred fifty-four".