639527374 has 8 divisors (see below), whose sum is σ = 1000999440. Its totient is φ = 305860896.

The previous prime is 639527353. The next prime is 639527381. The reversal of 639527374 is 473725936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (46), and also a Moran number because the ratio is a prime number: 13902769 = 639527374 / (6 + 3 + 9 + 5 + 2 + 7 + 3 + 7 + 4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6951339 + ... + 6951430.

It is an arithmetic number, because the mean of its divisors is an integer number (125124930).

Almost surely, 2^639527374 is an apocalyptic number.

639527374 is a deficient number, since it is larger than the sum of its proper divisors (361472066).

639527374 is a wasteful number, since it uses less digits than its factorization.

639527374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13902794.

The product of its digits is 952560, while the sum is 46.

The square root of 639527374 is about 25288.8784646532. The cubic root of 639527374 is about 861.5616900539.

The spelling of 639527374 in words is "six hundred thirty-nine million, five hundred twenty-seven thousand, three hundred seventy-four".