39670439 has 2 divisors, whose sum is σ = 39670440. Its totient is φ = 39670438.

The previous prime is 39670429. The next prime is 39670453. The reversal of 39670439 is 93407693.

It is a weak prime.

It is an emirp because it is prime and its reverse (93407693) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39670439 - 2¹² = 39666343 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 39670396 and 39670405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39670429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19835219 + 19835220.

It is an arithmetic number, because the mean of its divisors is an integer number (19835220).

Almost surely, 2^39670439 is an apocalyptic number.

39670439 is a deficient number, since it is larger than the sum of its proper divisors (1).

39670439 is an equidigital number, since it uses as much as digits as its factorization.

39670439 is an evil number, because the sum of its binary digits is even.

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

The square root of 39670439 is about 6298.4473483550. The cubic root of 39670439 is about 341.0533623630.

The spelling of 39670439 in words is "thirty-nine million, six hundred seventy thousand, four hundred thirty-nine".