2640249 has 8 divisors (see below), whose sum is σ = 3911520. Its totient is φ = 1760148.

The previous prime is 2640227. The next prime is 2640251. The reversal of 2640249 is 9420462.

It is not a de Polignac number, because 2640249 - 2⁵ = 2640217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 97787 = 2640249 / (2 + 6 + 4 + 0 + 2 + 4 + 9).

It is a d-powerful number, because it can be written as 2⁵ + 6⁷ + 4⁴ + 0 + 2²¹ + 4⁹ + 9³ .

It is not an unprimeable number, because it can be changed into a prime (2640289) 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, 48867 + ... + 48920.

It is an arithmetic number, because the mean of its divisors is an integer number (488940).

2^2640249 is an apocalyptic number.

It is an amenable number.

2640249 is a deficient number, since it is larger than the sum of its proper divisors (1271271).

2640249 is an equidigital number, since it uses as much as digits as its factorization.

2640249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97796 (or 97790 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 2640249 is about 1624.8843035736. The cubic root of 2640249 is about 138.2128096540.

The spelling of 2640249 in words is "two million, six hundred forty thousand, two hundred forty-nine".