1285864 has 16 divisors (see below), whose sum is σ = 2448000. Its totient is φ = 633072.

The previous prime is 1285859. The next prime is 1285871. The reversal of 1285864 is 4685821.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 664 + ... + 1735.

It is an arithmetic number, because the mean of its divisors is an integer number (153000).

2^1285864 is an apocalyptic number.

It is an amenable number.

1285864 is a deficient number, since it is larger than the sum of its proper divisors (1162136).

1285864 is a wasteful number, since it uses less digits than its factorization.

1285864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2472 (or 2468 counting only the distinct ones).

The product of its digits is 15360, while the sum is 34.

The square root of 1285864 is about 1133.9594349006. The cubic root of 1285864 is about 108.7422577833.

The spelling of 1285864 in words is "one million, two hundred eighty-five thousand, eight hundred sixty-four".