39997973 has 2 divisors, whose sum is σ = 39997974. Its totient is φ = 39997972.

The previous prime is 39997939. The next prime is 39998009. The reversal of 39997973 is 37979993.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30713764 + 9284209 = 5542^2 + 3047^2 .

It is a cyclic number.

It is not a de Polignac number, because 39997973 - 2¹⁶ = 39932437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39997933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19998986 + 19998987.

It is an arithmetic number, because the mean of its divisors is an integer number (19998987).

Almost surely, 2^39997973 is an apocalyptic number.

It is an amenable number.

39997973 is a deficient number, since it is larger than the sum of its proper divisors (1).

39997973 is an equidigital number, since it uses as much as digits as its factorization.

39997973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2893401, while the sum is 56.

The square root of 39997973 is about 6324.3950698861. The cubic root of 39997973 is about 341.9894123690.

The spelling of 39997973 in words is "thirty-nine million, nine hundred ninety-seven thousand, nine hundred seventy-three".