39023981 has 2 divisors, whose sum is σ = 39023982. Its totient is φ = 39023980.

The previous prime is 39023951. The next prime is 39024017. The reversal of 39023981 is 18932093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20884900 + 18139081 = 4570^2 + 4259^2 .

It is an emirp because it is prime and its reverse (18932093) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39023981 - 2¹⁸ = 38761837 is a prime.

It is a super-2 number, since 2×39023981² = 3045742186176722, 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 (39023951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19511990 + 19511991.

It is an arithmetic number, because the mean of its divisors is an integer number (19511991).

Almost surely, 2^39023981 is an apocalyptic number.

It is an amenable number.

39023981 is a deficient number, since it is larger than the sum of its proper divisors (1).

39023981 is an equidigital number, since it uses as much as digits as its factorization.

39023981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 39023981 is about 6246.9177199640. The cubic root of 39023981 is about 339.1906383002.

It can be divided in two parts, 39023 and 981, that added together give a palindrome (40004).

The spelling of 39023981 in words is "thirty-nine million, twenty-three thousand, nine hundred eighty-one".