2645990 has 8 divisors (see below), whose sum is σ = 4762800. Its totient is φ = 1058392.

The previous prime is 2645987. The next prime is 2646001. The reversal of 2645990 is 995462.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2645990.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132290 + ... + 132309.

It is an arithmetic number, because the mean of its divisors is an integer number (595350).

2^2645990 is an apocalyptic number.

2645990 is a deficient number, since it is larger than the sum of its proper divisors (2116810).

2645990 is a wasteful number, since it uses less digits than its factorization.

2645990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264606.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 2645990 is about 1626.6499316079. The cubic root of 2645990 is about 138.3129145198.

The spelling of 2645990 in words is "two million, six hundred forty-five thousand, nine hundred ninety".