638045930 has 16 divisors (see below), whose sum is σ = 1149254784. Its totient is φ = 255046800.

The previous prime is 638045893. The next prime is 638045957. The reversal of 638045930 is 39540836.

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, 5246 + ... + 36105.

It is an arithmetic number, because the mean of its divisors is an integer number (71828424).

Almost surely, 2^638045930 is an apocalyptic number.

638045930 is a deficient number, since it is larger than the sum of its proper divisors (511208854).

638045930 is a wasteful number, since it uses less digits than its factorization.

638045930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42901.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 638045930 is about 25259.5710573240. The cubic root of 638045930 is about 860.8959159924.

The spelling of 638045930 in words is "six hundred thirty-eight million, forty-five thousand, nine hundred thirty".