1806864 has 20 divisors (see below), whose sum is σ = 4667856. Its totient is φ = 602272.

The previous prime is 1806863. The next prime is 1806869. The reversal of 1806864 is 4686081.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1806863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18774 + ... + 18869.

2^1806864 is an apocalyptic number.

It is an amenable number.

1806864 is an abundant number, since it is smaller than the sum of its proper divisors (2860992).

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

1806864 is a wasteful number, since it uses less digits than its factorization.

1806864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37654 (or 37648 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 1806864 is about 1344.1964142193. The cubic root of 1806864 is about 121.7984668744.

The spelling of 1806864 in words is "one million, eight hundred six thousand, eight hundred sixty-four".