639012465 has 192 divisors, whose sum is σ = 1476034560. Its totient is φ = 248209920.

The previous prime is 639012443. The next prime is 639012481. The reversal of 639012465 is 564210936.

It is a happy number.

639012465 is a `hidden beast` number, since 639 + 0 + 12 + 4 + 6 + 5 = 666.

It is not a de Polignac number, because 639012465 - 2¹³ = 639004273 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 3345520 + ... + 3345710.

It is an arithmetic number, because the mean of its divisors is an integer number (7687680).

Almost surely, 2^639012465 is an apocalyptic number.

639012465 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

639012465 is an abundant number, since it is smaller than the sum of its proper divisors (837022095).

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

639012465 is a wasteful number, since it uses less digits than its factorization.

639012465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284 (or 281 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 639012465 is about 25278.6958722162. The cubic root of 639012465 is about 861.3304020747.

It can be divided in two parts, 63901 and 2465, that added together give a palindrome (66366).

The spelling of 639012465 in words is "six hundred thirty-nine million, twelve thousand, four hundred sixty-five".