39983947 has 2 divisors, whose sum is σ = 39983948. Its totient is φ = 39983946.

The previous prime is 39983941. The next prime is 39983969. The reversal of 39983947 is 74938993.

It is a weak prime.

It is an emirp because it is prime and its reverse (74938993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39983947 - 2⁷ = 39983819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39983894 and 39983903.

It is not a weakly prime, because it can be changed into another prime (39983941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19991973 + 19991974.

It is an arithmetic number, because the mean of its divisors is an integer number (19991974).

Almost surely, 2^39983947 is an apocalyptic number.

39983947 is a deficient number, since it is larger than the sum of its proper divisors (1).

39983947 is an equidigital number, since it uses as much as digits as its factorization.

39983947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1469664, while the sum is 52.

The square root of 39983947 is about 6323.2860918987. The cubic root of 39983947 is about 341.9494328073.

The spelling of 39983947 in words is "thirty-nine million, nine hundred eighty-three thousand, nine hundred forty-seven".