2640307 has 4 divisors (see below), whose sum is σ = 2664640. Its totient is φ = 2615976.

The previous prime is 2640299. The next prime is 2640317. The reversal of 2640307 is 7030462.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2640307 - 2³ = 2640299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2640317) 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, 12003 + ... + 12220.

It is an arithmetic number, because the mean of its divisors is an integer number (666160).

2^2640307 is an apocalyptic number.

2640307 is a deficient number, since it is larger than the sum of its proper divisors (24333).

2640307 is a wasteful number, since it uses less digits than its factorization.

2640307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24332.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 2640307 is about 1624.9021509002. The cubic root of 2640307 is about 138.2138217156.

Adding to 2640307 its reverse (7030462), we get a palindrome (9670769).

The spelling of 2640307 in words is "two million, six hundred forty thousand, three hundred seven".