2604989 has 4 divisors (see below), whose sum is σ = 2628156. Its totient is φ = 2581824.

The previous prime is 2604977. The next prime is 2604997. The reversal of 2604989 is 9894062.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 828100 + 1776889 = 910^2 + 1333^2 .

It is not a de Polignac number, because 2604989 - 2⁸ = 2604733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2604949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11414 + ... + 11639.

It is an arithmetic number, because the mean of its divisors is an integer number (657039).

2^2604989 is an apocalyptic number.

It is an amenable number.

2604989 is a deficient number, since it is larger than the sum of its proper divisors (23167).

2604989 is a wasteful number, since it uses less digits than its factorization.

2604989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23166.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 2604989 is about 1613.9978314731. The cubic root of 2604989 is about 137.5947820324.

The spelling of 2604989 in words is "two million, six hundred four thousand, nine hundred eighty-nine".