285857940 has 48 divisors (see below), whose sum is σ = 802323648. Its totient is φ = 76045824.

The previous prime is 285857939. The next prime is 285857969. The reversal of 285857940 is 49758582.

It is a super-2 number, since 2×285857940² = 163429523722087200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 285857940.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20479 + ... + 31481.

It is an arithmetic number, because the mean of its divisors is an integer number (16715076).

Almost surely, 2^285857940 is an apocalyptic number.

285857940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285857940 is an abundant number, since it is smaller than the sum of its proper divisors (516465708).

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

285857940 is a wasteful number, since it uses less digits than its factorization.

285857940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11448 (or 11446 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 48.

The square root of 285857940 is about 16907.3339116491. Note that the first 3 decimals coincide. The cubic root of 285857940 is about 658.7441223354.

The spelling of 285857940 in words is "two hundred eighty-five million, eight hundred fifty-seven thousand, nine hundred forty".