2391257 has 4 divisors (see below), whose sum is σ = 2608656. Its totient is φ = 2173860.

The previous prime is 2391239. The next prime is 2391269. The reversal of 2391257 is 7521932.

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 2391257 - 2⁸ = 2391001 is a prime.

It is a super-2 number, since 2×2391257² = 11436220080098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2391227) 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, 108683 + ... + 108704.

It is an arithmetic number, because the mean of its divisors is an integer number (652164).

2^2391257 is an apocalyptic number.

It is an amenable number.

2391257 is a deficient number, since it is larger than the sum of its proper divisors (217399).

2391257 is a wasteful number, since it uses less digits than its factorization.

2391257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217398.

The product of its digits is 3780, while the sum is 29.

The square root of 2391257 is about 1546.3689727875. The cubic root of 2391257 is about 133.7238129650.

The spelling of 2391257 in words is "two million, three hundred ninety-one thousand, two hundred fifty-seven".