638402350 has 12 divisors (see below), whose sum is σ = 1187428464. Its totient is φ = 255360920.

The previous prime is 638402333. The next prime is 638402371. The reversal of 638402350 is 53204836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6383974 + ... + 6384073.

It is an arithmetic number, because the mean of its divisors is an integer number (98952372).

Almost surely, 2^638402350 is an apocalyptic number.

638402350 is a deficient number, since it is larger than the sum of its proper divisors (549026114).

638402350 is a wasteful number, since it uses less digits than its factorization.

638402350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12768059 (or 12768054 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 638402350 is about 25266.6252198429. The cubic root of 638402350 is about 861.0561883651.

The spelling of 638402350 in words is "six hundred thirty-eight million, four hundred two thousand, three hundred fifty".