2151604 has 48 divisors (see below), whose sum is σ = 4854528. Its totient is φ = 811008.

The previous prime is 2151593. The next prime is 2151607. The reversal of 2151604 is 4061512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151607) 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, 8244 + ... + 8500.

It is an arithmetic number, because the mean of its divisors is an integer number (101136).

2^2151604 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 2151604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2427264).

2151604 is an abundant number, since it is smaller than the sum of its proper divisors (2702924).

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

2151604 is a wasteful number, since it uses less digits than its factorization.

2151604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304 (or 302 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 2151604 is about 1466.8346873455. The cubic root of 2151604 is about 129.0983765735.

The spelling of 2151604 in words is "two million, one hundred fifty-one thousand, six hundred four".