39421439 has 2 divisors, whose sum is σ = 39421440. Its totient is φ = 39421438.

The previous prime is 39421399. The next prime is 39421451. The reversal of 39421439 is 93412493.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39421439 - 2⁸ = 39421183 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 39421399 and 39421408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39421489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19710719 + 19710720.

It is an arithmetic number, because the mean of its divisors is an integer number (19710720).

Almost surely, 2^39421439 is an apocalyptic number.

39421439 is a deficient number, since it is larger than the sum of its proper divisors (1).

39421439 is an equidigital number, since it uses as much as digits as its factorization.

39421439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 35.

The square root of 39421439 is about 6278.6494566905. The cubic root of 39421439 is about 340.3382993826.

The spelling of 39421439 in words is "thirty-nine million, four hundred twenty-one thousand, four hundred thirty-nine".