2639399 has 8 divisors (see below), whose sum is σ = 3032448. Its totient is φ = 2250360.

The previous prime is 2639393. The next prime is 2639401. The reversal of 2639399 is 9939362.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-2639399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2639393) 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, 584 + ... + 2370.

It is an arithmetic number, because the mean of its divisors is an integer number (379056).

2^2639399 is an apocalyptic number.

2639399 is a deficient number, since it is larger than the sum of its proper divisors (393049).

2639399 is a wasteful number, since it uses less digits than its factorization.

2639399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2005.

The product of its digits is 78732, while the sum is 41.

The square root of 2639399 is about 1624.6227254350. The cubic root of 2639399 is about 138.1979760155.

The spelling of 2639399 in words is "two million, six hundred thirty-nine thousand, three hundred ninety-nine".