2640493 has 4 divisors (see below), whose sum is σ = 2647840. Its totient is φ = 2633148.

The previous prime is 2640409. The next prime is 2640497. The reversal of 2640493 is 3940462.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2640493 - 2²¹ = 543341 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 (2640497) 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, 3105 + ... + 3862.

It is an arithmetic number, because the mean of its divisors is an integer number (661960).

2^2640493 is an apocalyptic number.

It is an amenable number.

2640493 is a deficient number, since it is larger than the sum of its proper divisors (7347).

2640493 is an equidigital number, since it uses as much as digits as its factorization.

2640493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7346.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 2640493 is about 1624.9593841078. The cubic root of 2640493 is about 138.2170671927.

The spelling of 2640493 in words is "two million, six hundred forty thousand, four hundred ninety-three".