638286093 has 12 divisors (see below), whose sum is σ = 931474908. Its totient is φ = 421136640.

The previous prime is 638286083. The next prime is 638286113. The reversal of 638286093 is 390682836.

638286093 is a `hidden beast` number, since 6 + 38 + 2 + 8 + 609 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 138227049 + 500059044 = 11757^2 + 22362^2 .

It is a de Polignac number, because none of the positive numbers 2^k-638286093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638286053) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 364698 + ... + 366443.

It is an arithmetic number, because the mean of its divisors is an integer number (77622909).

Almost surely, 2^638286093 is an apocalyptic number.

It is an amenable number.

638286093 is a deficient number, since it is larger than the sum of its proper divisors (293188815).

638286093 is a wasteful number, since it uses less digits than its factorization.

638286093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731244 (or 731241 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The square root of 638286093 is about 25264.3245110571. The cubic root of 638286093 is about 861.0039173135.

The spelling of 638286093 in words is "six hundred thirty-eight million, two hundred eighty-six thousand, ninety-three".