2157804 has 36 divisors (see below), whose sum is σ = 5951400. Its totient is φ = 653760.

The previous prime is 2157797. The next prime is 2157821. The reversal of 2157804 is 4087512.

2157804 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×2157804² = 9312236204832, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2329 + ... + 3120.

2^2157804 is an apocalyptic number.

It is an amenable number.

2157804 is an abundant number, since it is smaller than the sum of its proper divisors (3793596).

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

2157804 is a wasteful number, since it uses less digits than its factorization.

2157804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5470 (or 5465 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 2157804 is about 1468.9465613153. The cubic root of 2157804 is about 129.2222597092. Note that the first 4 decimals are identical.

The spelling of 2157804 in words is "two million, one hundred fifty-seven thousand, eight hundred four".