2640239 has 16 divisors (see below), whose sum is σ = 3256320. Its totient is φ = 2094840.

The previous prime is 2640227. The next prime is 2640251. The reversal of 2640239 is 9320462.

2640239 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2640227) and next prime (2640251).

It is not a de Polignac number, because 2640239 - 2¹² = 2636143 is a prime.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85154 + ... + 85184.

It is an arithmetic number, because the mean of its divisors is an integer number (203520).

2^2640239 is an apocalyptic number.

2640239 is a deficient number, since it is larger than the sum of its proper divisors (616081).

2640239 is an frugal number, since it uses more digits than its factorization.

2640239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107 (or 61 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 2640239 is about 1624.8812264286. The cubic root of 2640239 is about 138.2126351591.

The spelling of 2640239 in words is "two million, six hundred forty thousand, two hundred thirty-nine".