39077981 has 2 divisors, whose sum is σ = 39077982. Its totient is φ = 39077980.

The previous prime is 39077947. The next prime is 39078023. The reversal of 39077981 is 18977093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37625956 + 1452025 = 6134^2 + 1205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39077981 is a prime.

It is a super-2 number, since 2×39077981² = 3054177198072722, 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 (39077911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19538990 + 19538991.

It is an arithmetic number, because the mean of its divisors is an integer number (19538991).

Almost surely, 2^39077981 is an apocalyptic number.

It is an amenable number.

39077981 is a deficient number, since it is larger than the sum of its proper divisors (1).

39077981 is an equidigital number, since it uses as much as digits as its factorization.

39077981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 39077981 is about 6251.2383573177. The cubic root of 39077981 is about 339.3470195134.

The spelling of 39077981 in words is "thirty-nine million, seventy-seven thousand, nine hundred eighty-one".