1231864 has 16 divisors (see below), whose sum is σ = 2364120. Its totient is φ = 601440.

The previous prime is 1231859. The next prime is 1231873. The reversal of 1231864 is 4681321.

It is a congruent number.

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, 1447 + ... + 2134.

2^1231864 is an apocalyptic number.

It is an amenable number.

1231864 is a deficient number, since it is larger than the sum of its proper divisors (1132256).

1231864 is a wasteful number, since it uses less digits than its factorization.

1231864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3630 (or 3626 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 1231864 is about 1109.8936886027. The cubic root of 1231864 is about 107.1982234056.

The spelling of 1231864 in words is "one million, two hundred thirty-one thousand, eight hundred sixty-four".