2540649 has 8 divisors (see below), whose sum is σ = 3534912. Its totient is φ = 1620080.

The previous prime is 2540641. The next prime is 2540663. The reversal of 2540649 is 9460452.

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

It is a cyclic number.

It is not a de Polignac number, because 2540649 - 2³ = 2540641 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2540641) 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, 18342 + ... + 18479.

It is an arithmetic number, because the mean of its divisors is an integer number (441864).

2^2540649 is an apocalyptic number.

It is an amenable number.

2540649 is a deficient number, since it is larger than the sum of its proper divisors (994263).

2540649 is a wasteful number, since it uses less digits than its factorization.

2540649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36847.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 2540649 is about 1593.9413414552. The cubic root of 2540649 is about 136.4525187404.

The spelling of 2540649 in words is "two million, five hundred forty thousand, six hundred forty-nine".