399027916933949 has 2 divisors, whose sum is σ = 399027916933950. Its totient is φ = 399027916933948.

The previous prime is 399027916933927. The next prime is 399027916934047. The reversal of 399027916933949 is 949339619720993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 392774131360900 + 6253785573049 = 19818530^2 + 2500757^2 .

It is an emirp because it is prime and its reverse (949339619720993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399027916933949 - 2⁴⁸ = 117552940223293 is a prime.

It is a super-2 number, since 2×399027916933949² (a number of 30 digits) contains 22 as substring.

It is a Sophie Germain 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 (399027916932949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199513958466974 + 199513958466975.

It is an arithmetic number, because the mean of its divisors is an integer number (199513958466975).

Almost surely, 2^{399027916933949} is an apocalyptic number.

It is an amenable number.

399027916933949 is a deficient number, since it is larger than the sum of its proper divisors (1).

399027916933949 is an equidigital number, since it uses as much as digits as its factorization.

399027916933949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4821232752, while the sum is 83.

The spelling of 399027916933949 in words is "three hundred ninety-nine trillion, twenty-seven billion, nine hundred sixteen million, nine hundred thirty-three thousand, nine hundred forty-nine".