285143898 has 24 divisors (see below), whose sum is σ = 617532768. Its totient is φ = 87736272.

The previous prime is 285143851. The next prime is 285143909. The reversal of 285143898 is 898341582.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 139590 + ... + 141617.

It is an arithmetic number, because the mean of its divisors is an integer number (25730532).

Almost surely, 2^285143898 is an apocalyptic number.

285143898 is an abundant number, since it is smaller than the sum of its proper divisors (332388870).

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

285143898 is a wasteful number, since it uses less digits than its factorization.

285143898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281238 (or 281225 counting only the distinct ones).

The product of its digits is 552960, while the sum is 48.

The square root of 285143898 is about 16886.2043692477. The cubic root of 285143898 is about 658.1951746540.

The spelling of 285143898 in words is "two hundred eighty-five million, one hundred forty-three thousand, eight hundred ninety-eight".