39978683 has 2 divisors, whose sum is σ = 39978684. Its totient is φ = 39978682.

The previous prime is 39978677. The next prime is 39978709. The reversal of 39978683 is 38687993.

It is a weak prime.

It is an emirp because it is prime and its reverse (38687993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39978683 - 2⁴ = 39978667 is a prime.

It is not a weakly prime, because it can be changed into another prime (39978083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19989341 + 19989342.

It is an arithmetic number, because the mean of its divisors is an integer number (19989342).

Almost surely, 2^39978683 is an apocalyptic number.

39978683 is a deficient number, since it is larger than the sum of its proper divisors (1).

39978683 is an equidigital number, since it uses as much as digits as its factorization.

39978683 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 53.

The square root of 39978683 is about 6322.8698389260. The cubic root of 39978683 is about 341.9344259445.

The spelling of 39978683 in words is "thirty-nine million, nine hundred seventy-eight thousand, six hundred eighty-three".