639343452 has 48 divisors (see below), whose sum is σ = 1658143872. Its totient is φ = 190082880.

The previous prime is 639343451. The next prime is 639343469. The reversal of 639343452 is 254343936.

It is a self number, because there is not a number n which added to its sum of digits gives 639343452.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639343451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38698 + ... + 52689.

It is an arithmetic number, because the mean of its divisors is an integer number (34544664).

Almost surely, 2^639343452 is an apocalyptic number.

It is an amenable number.

639343452 is an abundant number, since it is smaller than the sum of its proper divisors (1018800420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639343452 is a wasteful number, since it uses less digits than its factorization.

639343452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91458 (or 91456 counting only the distinct ones).

The product of its digits is 233280, while the sum is 39.

The square root of 639343452 is about 25285.2417825102. The cubic root of 639343452 is about 861.4790898147.

The spelling of 639343452 in words is "six hundred thirty-nine million, three hundred forty-three thousand, four hundred fifty-two".