2155604 has 12 divisors (see below), whose sum is σ = 4115328. Its totient is φ = 979800.

The previous prime is 2155603. The next prime is 2155609. The reversal of 2155604 is 4065512.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2155604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24452 + ... + 24539.

It is an arithmetic number, because the mean of its divisors is an integer number (342944).

2^2155604 is an apocalyptic number.

It is an amenable number.

2155604 is a deficient number, since it is larger than the sum of its proper divisors (1959724).

2155604 is a wasteful number, since it uses less digits than its factorization.

2155604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49006 (or 49004 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 2155604 is about 1468.1975343938. The cubic root of 2155604 is about 129.1783283725.

The spelling of 2155604 in words is "two million, one hundred fifty-five thousand, six hundred four".