2642813 has 4 divisors (see below), whose sum is σ = 2660700. Its totient is φ = 2624928.

The previous prime is 2642797. The next prime is 2642821. The reversal of 2642813 is 3182462.

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 1304164 + 1338649 = 1142^2 + 1157^2 .

It is a cyclic number.

It is not a de Polignac number, because 2642813 - 2⁴ = 2642797 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 (2642863) 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, 8720 + ... + 9017.

It is an arithmetic number, because the mean of its divisors is an integer number (665175).

2^2642813 is an apocalyptic number.

It is an amenable number.

2642813 is a deficient number, since it is larger than the sum of its proper divisors (17887).

2642813 is a wasteful number, since it uses less digits than its factorization.

2642813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17886.

The product of its digits is 2304, while the sum is 26.

The square root of 2642813 is about 1625.6730913686. The cubic root of 2642813 is about 138.2575356112.

The spelling of 2642813 in words is "two million, six hundred forty-two thousand, eight hundred thirteen".