2640257 has 4 divisors (see below), whose sum is σ = 2650560. Its totient is φ = 2629956.

The previous prime is 2640251. The next prime is 2640271. The reversal of 2640257 is 7520462.

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 2640257 - 2¹⁶ = 2574721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2640251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4757 + ... + 5282.

It is an arithmetic number, because the mean of its divisors is an integer number (662640).

2^2640257 is an apocalyptic number.

It is an amenable number.

2640257 is a deficient number, since it is larger than the sum of its proper divisors (10303).

2640257 is a wasteful number, since it uses less digits than its factorization.

2640257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10302.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 2640257 is about 1624.8867652855. The cubic root of 2640257 is about 138.2129492496.

The spelling of 2640257 in words is "two million, six hundred forty thousand, two hundred fifty-seven".