285397387938 has 24 divisors (see below), whose sum is σ = 665927239068. Its totient is φ = 87814580832.

The previous prime is 285397387937. The next prime is 285397387949. The reversal of 285397387938 is 839783793582.

285397387938 is a `hidden beast` number, since 2 + 8 + 539 + 7 + 3 + 87 + 9 + 3 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 217759422609 + 67637965329 = 466647^2 + 260073^2 .

It is not an unprimeable number, because it can be changed into a prime (285397387937) 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, 609823245 + ... + 609823712.

Almost surely, 2^285397387938 is an apocalyptic number.

285397387938 is an abundant number, since it is smaller than the sum of its proper divisors (380529851130).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

285397387938 is a wasteful number, since it uses less digits than its factorization.

285397387938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1219646978 (or 1219646975 counting only the distinct ones).

The product of its digits is 548674560, while the sum is 72.

The spelling of 285397387938 in words is "two hundred eighty-five billion, three hundred ninety-seven million, three hundred eighty-seven thousand, nine hundred thirty-eight".