39982409 has 2 divisors, whose sum is σ = 39982410. Its totient is φ = 39982408.

The previous prime is 39982391. The next prime is 39982417. The reversal of 39982409 is 90428993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24403600 + 15578809 = 4940^2 + 3947^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39982409 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39982409.

It is not a weakly prime, because it can be changed into another prime (39982429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19991204 + 19991205.

It is an arithmetic number, because the mean of its divisors is an integer number (19991205).

Almost surely, 2^39982409 is an apocalyptic number.

It is an amenable number.

39982409 is a deficient number, since it is larger than the sum of its proper divisors (1).

39982409 is an equidigital number, since it uses as much as digits as its factorization.

39982409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 39982409 is about 6323.1644767474. The cubic root of 39982409 is about 341.9450483396.

The spelling of 39982409 in words is "thirty-nine million, nine hundred eighty-two thousand, four hundred nine".