285681986 has 16 divisors (see below), whose sum is σ = 452536800. Its totient is φ = 134885088.

The previous prime is 285681983. The next prime is 285682003. The reversal of 285681986 is 689186582.

It is a super-2 number, since 2×285681986² = 163228394249808392, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (285681983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116 + ... + 23903.

It is an arithmetic number, because the mean of its divisors is an integer number (28283550).

Almost surely, 2^285681986 is an apocalyptic number.

285681986 is a deficient number, since it is larger than the sum of its proper divisors (166854814).

285681986 is a wasteful number, since it uses less digits than its factorization.

285681986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24353.

The product of its digits is 1658880, while the sum is 53.

The square root of 285681986 is about 16902.1296291325. The cubic root of 285681986 is about 658.6089357772.

The spelling of 285681986 in words is "two hundred eighty-five million, six hundred eighty-one thousand, nine hundred eighty-six".