2739639 has 12 divisors (see below), whose sum is σ = 4249464. Its totient is φ = 1565424.

The previous prime is 2739637. The next prime is 2739643. The reversal of 2739639 is 9369372.

It is not a de Polignac number, because 2739639 - 2¹ = 2739637 is a prime.

It is a d-powerful number, because it can be written as 2⁵ + 7⁷ + 3⁵ + 9 + 6⁸ + 3¹¹ + 9⁵ .

It is a plaindrome in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 2739597 and 2739606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2739631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9172 + ... + 9465.

It is an arithmetic number, because the mean of its divisors is an integer number (354122).

2^2739639 is an apocalyptic number.

2739639 is a deficient number, since it is larger than the sum of its proper divisors (1509825).

2739639 is a wasteful number, since it uses less digits than its factorization.

2739639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18654 (or 18647 counting only the distinct ones).

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

The square root of 2739639 is about 1655.1854880949. The cubic root of 2739639 is about 139.9257940079.

The spelling of 2739639 in words is "two million, seven hundred thirty-nine thousand, six hundred thirty-nine".