639790353 has 16 divisors (see below), whose sum is σ = 949393600. Its totient is φ = 425826720.

The previous prime is 639790351. The next prime is 639790381. The reversal of 639790353 is 353097936.

639790353 is a `hidden beast` number, since 639 + 7 + 9 + 0 + 3 + 5 + 3 = 666.

It is not a de Polignac number, because 639790353 - 2¹ = 639790351 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 639790299 and 639790308.

It is not an unprimeable number, because it can be changed into a prime (639790351) 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, 2428 + ... + 35853.

It is an arithmetic number, because the mean of its divisors is an integer number (59337100).

Almost surely, 2^639790353 is an apocalyptic number.

It is an amenable number.

639790353 is a deficient number, since it is larger than the sum of its proper divisors (309603247).

639790353 is a wasteful number, since it uses less digits than its factorization.

639790353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38909 (or 38903 counting only the distinct ones).

The product of its (nonzero) digits is 459270, while the sum is 45.

The square root of 639790353 is about 25294.0774293114. The cubic root of 639790353 is about 861.6797676592.

The spelling of 639790353 in words is "six hundred thirty-nine million, seven hundred ninety thousand, three hundred fifty-three".