2640699 has 12 divisors (see below), whose sum is σ = 3980496. Its totient is φ = 1683792.

The previous prime is 2640689. The next prime is 2640707. The reversal of 2640699 is 9960462.

2640699 is a `hidden beast` number, since 2 + 640 + 6 + 9 + 9 = 666.

2640699 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2640699 - 2⁴ = 2640683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2640689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6172 + ... + 6585.

It is an arithmetic number, because the mean of its divisors is an integer number (331708).

2^2640699 is an apocalyptic number.

2640699 is a deficient number, since it is larger than the sum of its proper divisors (1339797).

2640699 is a wasteful number, since it uses less digits than its factorization.

2640699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12786 (or 12783 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 2640699 is about 1625.0227690713. The cubic root of 2640699 is about 138.2206614679.

The spelling of 2640699 in words is "two million, six hundred forty thousand, six hundred ninety-nine".