7639439 has 2 divisors, whose sum is σ = 7639440. Its totient is φ = 7639438.

The previous prime is 7639433. The next prime is 7639481. The reversal of 7639439 is 9349367.

It is a weak prime.

It is an emirp because it is prime and its reverse (9349367) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7639439 - 2¹² = 7635343 is a prime.

It is a super-2 number, since 2×7639439² = 116722056469442, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 7639396 and 7639405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7639433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3819719 + 3819720.

It is an arithmetic number, because the mean of its divisors is an integer number (3819720).

Almost surely, 2^7639439 is an apocalyptic number.

7639439 is a deficient number, since it is larger than the sum of its proper divisors (1).

7639439 is an equidigital number, since it uses as much as digits as its factorization.

7639439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 41.

The square root of 7639439 is about 2763.9535090157. The cubic root of 7639439 is about 196.9490192490.

The spelling of 7639439 in words is "seven million, six hundred thirty-nine thousand, four hundred thirty-nine".