2540257 has 4 divisors (see below), whose sum is σ = 2543616. Its totient is φ = 2536900.

The previous prime is 2540249. The next prime is 2540261. The reversal of 2540257 is 7520452.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2540257 - 2³ = 2540249 is a prime.

It is a Duffinian number.

2540257 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2540957) 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, 48 + ... + 2254.

It is an arithmetic number, because the mean of its divisors is an integer number (635904).

2^2540257 is an apocalyptic number.

It is an amenable number.

2540257 is a deficient number, since it is larger than the sum of its proper divisors (3359).

2540257 is a wasteful number, since it uses less digits than its factorization.

2540257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3358.

The product of its (nonzero) digits is 2800, while the sum is 25.

The square root of 2540257 is about 1593.8183710825. The cubic root of 2540257 is about 136.4455005679.

The spelling of 2540257 in words is "two million, five hundred forty thousand, two hundred fifty-seven".