2599945 has 4 divisors (see below), whose sum is σ = 3119940. Its totient is φ = 2079952.

The previous prime is 2599931. The next prime is 2599973. The reversal of 2599945 is 5499952.

It is a happy number.

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 1042441 + 1557504 = 1021^2 + 1248^2 .

It is a cyclic number.

It is not a de Polignac number, because 2599945 - 2¹¹ = 2597897 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259990 + ... + 259999.

It is an arithmetic number, because the mean of its divisors is an integer number (779985).

2^2599945 is an apocalyptic number.

It is an amenable number.

2599945 is a deficient number, since it is larger than the sum of its proper divisors (519995).

2599945 is an equidigital number, since it uses as much as digits as its factorization.

2599945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519994.

The product of its digits is 145800, while the sum is 43.

The square root of 2599945 is about 1612.4344947935. The cubic root of 2599945 is about 137.5059171007.

The spelling of 2599945 in words is "two million, five hundred ninety-nine thousand, nine hundred forty-five".