285400188 has 36 divisors (see below), whose sum is σ = 722908368. Its totient is φ = 94938240.

The previous prime is 285400187. The next prime is 285400201. The reversal of 285400188 is 881004582.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×285400188³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285400183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10228 + ... + 25988.

It is an arithmetic number, because the mean of its divisors is an integer number (20080788).

Almost surely, 2^285400188 is an apocalyptic number.

It is an amenable number.

285400188 is an abundant number, since it is smaller than the sum of its proper divisors (437508180).

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

285400188 is a wasteful number, since it uses less digits than its factorization.

285400188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16274 (or 16269 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 285400188 is about 16893.7914039448. The cubic root of 285400188 is about 658.3923129270.

The spelling of 285400188 in words is "two hundred eighty-five million, four hundred thousand, one hundred eighty-eight".