2640149 has 4 divisors (see below), whose sum is σ = 2643840. Its totient is φ = 2636460.

The previous prime is 2640139. The next prime is 2640163. The reversal of 2640149 is 9410462.

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 a de Polignac number, because none of the positive numbers 2^k-2640149 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 (2640139) 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, 389 + ... + 2330.

It is an arithmetic number, because the mean of its divisors is an integer number (660960).

2^2640149 is an apocalyptic number.

It is an amenable number.

2640149 is a deficient number, since it is larger than the sum of its proper divisors (3691).

2640149 is an equidigital number, since it uses as much as digits as its factorization.

2640149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3690.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 2640149 is about 1624.8535318606. The cubic root of 2640149 is about 138.2110646853.

The spelling of 2640149 in words is "two million, six hundred forty thousand, one hundred forty-nine".