39139643 has 2 divisors, whose sum is σ = 39139644. Its totient is φ = 39139642.

The previous prime is 39139631. The next prime is 39139649. The reversal of 39139643 is 34693193.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39139643 - 2¹⁸ = 38877499 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39139597 and 39139606.

It is not a weakly prime, because it can be changed into another prime (39139649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19569821 + 19569822.

It is an arithmetic number, because the mean of its divisors is an integer number (19569822).

Almost surely, 2^39139643 is an apocalyptic number.

39139643 is a deficient number, since it is larger than the sum of its proper divisors (1).

39139643 is an equidigital number, since it uses as much as digits as its factorization.

39139643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 38.

The square root of 39139643 is about 6256.1683960712. The cubic root of 39139643 is about 339.5254134078.

The spelling of 39139643 in words is "thirty-nine million, one hundred thirty-nine thousand, six hundred forty-three".