2639739 has 8 divisors (see below), whose sum is σ = 3528000. Its totient is φ = 1755656.

The previous prime is 2639723. The next prime is 2639759. The reversal of 2639739 is 9379362.

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 2639739 - 2⁴ = 2639723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2639697 and 2639706.

It is not an unprimeable number, because it can be changed into a prime (2639759) 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, 1012 + ... + 2510.

It is an arithmetic number, because the mean of its divisors is an integer number (441000).

2^2639739 is an apocalyptic number.

2639739 is a deficient number, since it is larger than the sum of its proper divisors (888261).

2639739 is a wasteful number, since it uses less digits than its factorization.

2639739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2089.

The product of its digits is 61236, while the sum is 39.

The square root of 2639739 is about 1624.7273617441. The cubic root of 2639739 is about 138.2039098530.

The spelling of 2639739 in words is "two million, six hundred thirty-nine thousand, seven hundred thirty-nine".