638000842 has 16 divisors (see below), whose sum is σ = 1003783680. Its totient is φ = 303773328.

The previous prime is 638000827. The next prime is 638000843. The reversal of 638000842 is 248000836.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (638000843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88242 + ... + 95197.

It is an arithmetic number, because the mean of its divisors is an integer number (62736480).

Almost surely, 2^638000842 is an apocalyptic number.

638000842 is a deficient number, since it is larger than the sum of its proper divisors (365782838).

638000842 is a wasteful number, since it uses less digits than its factorization.

638000842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183525.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 638000842 is about 25258.6785481743. The cubic root of 638000842 is about 860.8756368936.

The spelling of 638000842 in words is "six hundred thirty-eight million, eight hundred forty-two", and thus it is an aban number.