639417234 has 32 divisors (see below), whose sum is σ = 1318311936. Its totient is φ = 206644880.

The previous prime is 639417221. The next prime is 639417287. The reversal of 639417234 is 432714936.

639417234 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 639417192 and 639417201.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19579 + ... + 40769.

It is an arithmetic number, because the mean of its divisors is an integer number (41197248).

Almost surely, 2^639417234 is an apocalyptic number.

639417234 is an abundant number, since it is smaller than the sum of its proper divisors (678894702).

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

639417234 is a wasteful number, since it uses less digits than its factorization.

639417234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21350.

The product of its digits is 108864, while the sum is 39.

The square root of 639417234 is about 25286.7007337849. The cubic root of 639417234 is about 861.5122275621.

The spelling of 639417234 in words is "six hundred thirty-nine million, four hundred seventeen thousand, two hundred thirty-four".