399542381759 has 2 divisors, whose sum is σ = 399542381760. Its totient is φ = 399542381758.

The previous prime is 399542381753. The next prime is 399542381773. The reversal of 399542381759 is 957183245993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399542381759 - 2⁴ = 399542381743 is a prime.

It is a super-3 number, since 3×399542381759³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 399542381695 and 399542381704.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399542381753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199771190879 + 199771190880.

It is an arithmetic number, because the mean of its divisors is an integer number (199771190880).

Almost surely, 2^399542381759 is an apocalyptic number.

399542381759 is a deficient number, since it is larger than the sum of its proper divisors (1).

399542381759 is an equidigital number, since it uses as much as digits as its factorization.

399542381759 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73483200, while the sum is 65.

The spelling of 399542381759 in words is "three hundred ninety-nine billion, five hundred forty-two million, three hundred eighty-one thousand, seven hundred fifty-nine".