2157204 has 48 divisors (see below), whose sum is σ = 5860736. Its totient is φ = 604800.

The previous prime is 2157187. The next prime is 2157209. The reversal of 2157204 is 4027512.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4914 + ... + 5334.

2^2157204 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2157204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2930368).

2157204 is an abundant number, since it is smaller than the sum of its proper divisors (3703532).

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

2157204 is a wasteful number, since it uses less digits than its factorization.

2157204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496 (or 494 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 2157204 is about 1468.7423191289. The cubic root of 2157204 is about 129.2102813980.

The spelling of 2157204 in words is "two million, one hundred fifty-seven thousand, two hundred four".