638270379 has 24 divisors (see below), whose sum is σ = 933638160. Its totient is φ = 420139008.

The previous prime is 638270351. The next prime is 638270393. The reversal of 638270379 is 973072836.

It is a happy number.

638270379 is a `hidden beast` number, since 6 + 3 + 8 + 270 + 379 = 666.

It is not a de Polignac number, because 638270379 - 2¹² = 638266283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638270579) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 686587 + ... + 687515.

It is an arithmetic number, because the mean of its divisors is an integer number (38901590).

Almost surely, 2^638270379 is an apocalyptic number.

638270379 is a deficient number, since it is larger than the sum of its proper divisors (295367781).

638270379 is a wasteful number, since it uses less digits than its factorization.

638270379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819 (or 1816 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 45.

The square root of 638270379 is about 25264.0135172541. The cubic root of 638270379 is about 860.9968515548.

The spelling of 638270379 in words is "six hundred thirty-eight million, two hundred seventy thousand, three hundred seventy-nine".