2640457 has 8 divisors (see below), whose sum is σ = 2820096. Its totient is φ = 2463552.

The previous prime is 2640409. The next prime is 2640497. The reversal of 2640457 is 7540462.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2640457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2640497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1548 + ... + 2770.

It is an arithmetic number, because the mean of its divisors is an integer number (352512).

2^2640457 is an apocalyptic number.

It is an amenable number.

2640457 is a deficient number, since it is larger than the sum of its proper divisors (179639).

2640457 is a wasteful number, since it uses less digits than its factorization.

2640457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1367.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 2640457 is about 1624.9483068701. The cubic root of 2640457 is about 138.2164390477.

The spelling of 2640457 in words is "two million, six hundred forty thousand, four hundred fifty-seven".