639397354 has 16 divisors (see below), whose sum is σ = 963547200. Its totient is φ = 318219264.

The previous prime is 639397313. The next prime is 639397361. The reversal of 639397354 is 453793936.

It is a junction number, because it is equal to n+sod(n) for n = 639397298 and 639397307.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 674709 + ... + 675655.

It is an arithmetic number, because the mean of its divisors is an integer number (60221700).

Almost surely, 2^639397354 is an apocalyptic number.

639397354 is a deficient number, since it is larger than the sum of its proper divisors (324149846).

639397354 is a wasteful number, since it uses less digits than its factorization.

639397354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2157.

The product of its digits is 1837080, while the sum is 49.

The square root of 639397354 is about 25286.3076387202. The cubic root of 639397354 is about 861.5032990984.

The spelling of 639397354 in words is "six hundred thirty-nine million, three hundred ninety-seven thousand, three hundred fifty-four".