392981 has 2 divisors, whose sum is σ = 392982. Its totient is φ = 392980.

The previous prime is 392969. The next prime is 392983. The reversal of 392981 is 189293.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 240100 + 152881 = 490^2 + 391^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-392981 is a prime.

It is a super-2 number, since 2×392981² = 308868132722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 392983, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (392983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196490 + 196491.

It is an arithmetic number, because the mean of its divisors is an integer number (196491).

2³⁹²⁹⁸¹ is an apocalyptic number.

It is an amenable number.

392981 is a deficient number, since it is larger than the sum of its proper divisors (1).

392981 is an equidigital number, since it uses as much as digits as its factorization.

392981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 32.

The square root of 392981 is about 626.8819665615. The cubic root of 392981 is about 73.2471140053.

The spelling of 392981 in words is "three hundred ninety-two thousand, nine hundred eighty-one".