638146046 has 8 divisors (see below), whose sum is σ = 1007599080. Its totient is φ = 302279688.

The previous prime is 638146037. The next prime is 638146057. The reversal of 638146046 is 640641836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 16793317 = 638146046 / (6 + 3 + 8 + 1 + 4 + 6 + 0 + 4 + 6).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8396621 + ... + 8396696.

It is an arithmetic number, because the mean of its divisors is an integer number (125949885).

Almost surely, 2^638146046 is an apocalyptic number.

638146046 is a deficient number, since it is larger than the sum of its proper divisors (369453034).

638146046 is a wasteful number, since it uses less digits than its factorization.

638146046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16793338.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 638146046 is about 25261.5527234570. The cubic root of 638146046 is about 860.9409414594.

The spelling of 638146046 in words is "six hundred thirty-eight million, one hundred forty-six thousand, forty-six".