399786469997 has 2 divisors, whose sum is σ = 399786469998. Its totient is φ = 399786469996.

The previous prime is 399786469987. The next prime is 399786470053. The reversal of 399786469997 is 799964687993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 330480115876 + 69306354121 = 574874^2 + 263261^2 .

It is a cyclic number.

It is not a de Polignac number, because 399786469997 - 2⁸ = 399786469741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399786469937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199893234998 + 199893234999.

It is an arithmetic number, because the mean of its divisors is an integer number (199893234999).

Almost surely, 2^399786469997 is an apocalyptic number.

It is an amenable number.

399786469997 is a deficient number, since it is larger than the sum of its proper divisors (1).

399786469997 is an equidigital number, since it uses as much as digits as its factorization.

399786469997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9999593856, while the sum is 86.

The spelling of 399786469997 in words is "three hundred ninety-nine billion, seven hundred eighty-six million, four hundred sixty-nine thousand, nine hundred ninety-seven".