2439739 has 2 divisors, whose sum is σ = 2439740. Its totient is φ = 2439738.

The previous prime is 2439737. The next prime is 2439781. The reversal of 2439739 is 9379342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2439739 - 2¹ = 2439737 is a prime.

Together with 2439737, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2439698 and 2439707.

It is not a weakly prime, because it can be changed into another prime (2439737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1219869 + 1219870.

It is an arithmetic number, because the mean of its divisors is an integer number (1219870).

2^2439739 is an apocalyptic number.

2439739 is a deficient number, since it is larger than the sum of its proper divisors (1).

2439739 is an equidigital number, since it uses as much as digits as its factorization.

2439739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 37.

The square root of 2439739 is about 1561.9663888829. The cubic root of 2439739 is about 134.6215095737.

The spelling of 2439739 in words is "two million, four hundred thirty-nine thousand, seven hundred thirty-nine".