1800656 has 40 divisors (see below), whose sum is σ = 4103904. Its totient is φ = 754560.

The previous prime is 1800641. The next prime is 1800677. The reversal of 1800656 is 6560081.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1895 + ... + 2681.

2^1800656 is an apocalyptic number.

1800656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1800656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2051952).

1800656 is an abundant number, since it is smaller than the sum of its proper divisors (2303248).

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

1800656 is a wasteful number, since it uses less digits than its factorization.

1800656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819 (or 813 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1800656 is about 1341.8852409949. The cubic root of 1800656 is about 121.6588156148.

The spelling of 1800656 in words is "one million, eight hundred thousand, six hundred fifty-six".