399442941197 has 2 divisors, whose sum is σ = 399442941198. Its totient is φ = 399442941196.

The previous prime is 399442941127. The next prime is 399442941199. The reversal of 399442941197 is 791149244993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 381999399721 + 17443541476 = 618061^2 + 132074^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399442941197 is a prime.

Together with 399442941199, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399442941199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199721470598 + 199721470599.

It is an arithmetic number, because the mean of its divisors is an integer number (199721470599).

Almost surely, 2^399442941197 is an apocalyptic number.

It is an amenable number.

399442941197 is a deficient number, since it is larger than the sum of its proper divisors (1).

399442941197 is an equidigital number, since it uses as much as digits as its factorization.

399442941197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17635968, while the sum is 62.

The spelling of 399442941197 in words is "three hundred ninety-nine billion, four hundred forty-two million, nine hundred forty-one thousand, one hundred ninety-seven".