2640039 has 8 divisors (see below), whose sum is σ = 3555312. Its totient is φ = 1742400.

The previous prime is 2640023. The next prime is 2640041. The reversal of 2640039 is 9300462.

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

It is not a de Polignac number, because 2640039 - 2⁴ = 2640023 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640059) 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, 4054 + ... + 4659.

It is an arithmetic number, because the mean of its divisors is an integer number (444414).

2^2640039 is an apocalyptic number.

2640039 is a deficient number, since it is larger than the sum of its proper divisors (915273).

2640039 is a wasteful number, since it uses less digits than its factorization.

2640039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8817.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 2640039 is about 1624.8196823032. The cubic root of 2640039 is about 138.2091451689.

The spelling of 2640039 in words is "two million, six hundred forty thousand, thirty-nine".