2640293 has 4 divisors (see below), whose sum is σ = 2648940. Its totient is φ = 2631648.

The previous prime is 2640289. The next prime is 2640299. The reversal of 2640293 is 3920462.

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 228484 + 2411809 = 478^2 + 1553^2 .

It is a cyclic number.

It is not a de Polignac number, because 2640293 - 2² = 2640289 is a prime.

It is a super-2 number, since 2×2640293² = 13942294251698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640299) 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, 3848 + ... + 4481.

It is an arithmetic number, because the mean of its divisors is an integer number (662235).

2^2640293 is an apocalyptic number.

It is an amenable number.

2640293 is a deficient number, since it is larger than the sum of its proper divisors (8647).

2640293 is an equidigital number, since it uses as much as digits as its factorization.

2640293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8646.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 2640293 is about 1624.8978429427. The cubic root of 2640293 is about 138.2135774262.

The spelling of 2640293 in words is "two million, six hundred forty thousand, two hundred ninety-three".