285135138 has 12 divisors (see below), whose sum is σ = 617792838. Its totient is φ = 95045040.

The previous prime is 285135133. The next prime is 285135143. The reversal of 285135138 is 831531582.

285135138 is a `hidden beast` number, since 2 + 8 + 513 + 5 + 138 = 666.

It is an interprime number because it is at equal distance from previous prime (285135133) and next prime (285135143).

It can be written as a sum of positive squares in only one way, i.e., 144072009 + 141063129 = 12003^2 + 11877^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (285135133) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7920403 + ... + 7920438.

Almost surely, 2^285135138 is an apocalyptic number.

285135138 is an abundant number, since it is smaller than the sum of its proper divisors (332657700).

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

285135138 is a wasteful number, since it uses less digits than its factorization.

285135138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15840849 (or 15840846 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 285135138 is about 16885.9449839208. The cubic root of 285135138 is about 658.1884343744.

The spelling of 285135138 in words is "two hundred eighty-five million, one hundred thirty-five thousand, one hundred thirty-eight".