638608941 has 20 divisors (see below), whose sum is σ = 956399004. Its totient is φ = 424656000.

The previous prime is 638608877. The next prime is 638608967. The reversal of 638608941 is 149806836.

638608941 is a `hidden beast` number, since 6 + 38 + 608 + 9 + 4 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 534996900 + 103612041 = 23130^2 + 10179^2 .

It is not a de Polignac number, because 638608941 - 2⁶ = 638608877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638608441) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22651 + ... + 42311.

Almost surely, 2^638608941 is an apocalyptic number.

It is an amenable number.

638608941 is a deficient number, since it is larger than the sum of its proper divisors (317790063).

638608941 is a wasteful number, since it uses less digits than its factorization.

638608941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20074 (or 20065 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 638608941 is about 25270.7131082603. The cubic root of 638608941 is about 861.1490594069.

The spelling of 638608941 in words is "six hundred thirty-eight million, six hundred eight thousand, nine hundred forty-one".