2157604 has 6 divisors (see below), whose sum is σ = 3775814. Its totient is φ = 1078800.

The previous prime is 2157587. The next prime is 2157641. The reversal of 2157604 is 4067512.

It can be written as a sum of positive squares in only one way, i.e., 1695204 + 462400 = 1302^2 + 680^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269697 + ... + 269704.

2^2157604 is an apocalyptic number.

It is an amenable number.

2157604 is a deficient number, since it is larger than the sum of its proper divisors (1618210).

2157604 is a wasteful number, since it uses less digits than its factorization.

2157604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539405 (or 539403 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 2157604 is about 1468.8784837419. The cubic root of 2157604 is about 129.2182671855.

The spelling of 2157604 in words is "two million, one hundred fifty-seven thousand, six hundred four".