39323981 has 2 divisors, whose sum is σ = 39323982. Its totient is φ = 39323980.

The previous prime is 39323969. The next prime is 39323987. The reversal of 39323981 is 18932393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28793956 + 10530025 = 5366^2 + 3245^2 .

It is an emirp because it is prime and its reverse (18932393) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39323981 - 2⁶ = 39323917 is a prime.

It is a super-2 number, since 2×39323981² = 3092750963376722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39323987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19661990 + 19661991.

It is an arithmetic number, because the mean of its divisors is an integer number (19661991).

Almost surely, 2^39323981 is an apocalyptic number.

It is an amenable number.

39323981 is a deficient number, since it is larger than the sum of its proper divisors (1).

39323981 is an equidigital number, since it uses as much as digits as its factorization.

39323981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 38.

The square root of 39323981 is about 6270.8835900533. The cubic root of 39323981 is about 340.0576055797.

It can be divided in two parts, 39323 and 981, that added together give a palindrome (40304).

The spelling of 39323981 in words is "thirty-nine million, three hundred twenty-three thousand, nine hundred eighty-one".