639914033 has 4 divisors (see below), whose sum is σ = 698088048. Its totient is φ = 581740020.

The previous prime is 639913999. The next prime is 639914047. The reversal of 639914033 is 330419936.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 639914033 - 2⁶ = 639913969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639914063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29086991 + ... + 29087012.

It is an arithmetic number, because the mean of its divisors is an integer number (174522012).

Almost surely, 2^639914033 is an apocalyptic number.

It is an amenable number.

639914033 is a deficient number, since it is larger than the sum of its proper divisors (58174015).

639914033 is a wasteful number, since it uses less digits than its factorization.

639914033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58174014.

The product of its (nonzero) digits is 52488, while the sum is 38.

The square root of 639914033 is about 25296.5221522643. The cubic root of 639914033 is about 861.7352888085.

The spelling of 639914033 in words is "six hundred thirty-nine million, nine hundred fourteen thousand, thirty-three".