3139639 has 2 divisors, whose sum is σ = 3139640. Its totient is φ = 3139638.

The previous prime is 3139621. The next prime is 3139651. The reversal of 3139639 is 9369313.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3139639 - 2⁵ = 3139607 is a prime.

3139639 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3139699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1569819 + 1569820.

It is an arithmetic number, because the mean of its divisors is an integer number (1569820).

Almost surely, 2^3139639 is an apocalyptic number.

3139639 is a deficient number, since it is larger than the sum of its proper divisors (1).

3139639 is an equidigital number, since it uses as much as digits as its factorization.

3139639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13122, while the sum is 34.

The square root of 3139639 is about 1771.9026496961. The cubic root of 3139639 is about 146.4288230697.

The spelling of 3139639 in words is "three million, one hundred thirty-nine thousand, six hundred thirty-nine".