2156804 has 48 divisors (see below), whose sum is σ = 4468800. Its totient is φ = 902016.

The previous prime is 2156801. The next prime is 2156809. The reversal of 2156804 is 4086512.

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

It is not an unprimeable number, because it can be changed into a prime (2156801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36527 + ... + 36585.

It is an arithmetic number, because the mean of its divisors is an integer number (93100).

2^2156804 is an apocalyptic number.

It is an amenable number.

2156804 is an abundant number, since it is smaller than the sum of its proper divisors (2311996).

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

2156804 is a wasteful number, since it uses less digits than its factorization.

2156804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 2156804 is about 1468.6061418910. The cubic root of 2156804 is about 129.2022946232.

The spelling of 2156804 in words is "two million, one hundred fifty-six thousand, eight hundred four".