2321604 has 18 divisors (see below), whose sum is σ = 5868590. Its totient is φ = 773856.

The previous prime is 2321603. The next prime is 2321623. The reversal of 2321604 is 4061232.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2073600 + 248004 = 1440^2 + 498^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (2321603) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32209 + ... + 32280.

2^2321604 is an apocalyptic number.

It is an amenable number.

2321604 is an abundant number, since it is smaller than the sum of its proper divisors (3546986).

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

2321604 is a wasteful number, since it uses less digits than its factorization.

2321604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64499 (or 64494 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 2321604 is about 1523.6810689905. The cubic root of 2321604 is about 132.4126206849.

Adding to 2321604 its reverse (4061232), we get a palindrome (6382836).

The spelling of 2321604 in words is "two million, three hundred twenty-one thousand, six hundred four".