638300949 has 32 divisors (see below), whose sum is σ = 1026904704. Its totient is φ = 347431680.

The previous prime is 638300939. The next prime is 638300963. The reversal of 638300949 is 949003836.

It is not a de Polignac number, because 638300949 - 2⁵ = 638300917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 638300949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638300909) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4234 + ... + 35979.

It is an arithmetic number, because the mean of its divisors is an integer number (32090772).

Almost surely, 2^638300949 is an apocalyptic number.

It is an amenable number.

638300949 is a deficient number, since it is larger than the sum of its proper divisors (388603755).

638300949 is a wasteful number, since it uses less digits than its factorization.

638300949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40277.

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 638300949 is about 25264.6185207693. The cubic root of 638300949 is about 861.0105971682.

The spelling of 638300949 in words is "six hundred thirty-eight million, three hundred thousand, nine hundred forty-nine".