399241140869 has 2 divisors, whose sum is σ = 399241140870. Its totient is φ = 399241140868.

The previous prime is 399241140853. The next prime is 399241140877. The reversal of 399241140869 is 968041142993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221210308900 + 178030831969 = 470330^2 + 421937^2 .

It is a cyclic number.

It is not a de Polignac number, because 399241140869 - 2⁴ = 399241140853 is a prime.

It is a super-2 number, since 2×399241140869² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399241140899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199620570434 + 199620570435.

It is an arithmetic number, because the mean of its divisors is an integer number (199620570435).

Almost surely, 2^399241140869 is an apocalyptic number.

It is an amenable number.

399241140869 is a deficient number, since it is larger than the sum of its proper divisors (1).

399241140869 is an equidigital number, since it uses as much as digits as its factorization.

399241140869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3359232, while the sum is 56.

The spelling of 399241140869 in words is "three hundred ninety-nine billion, two hundred forty-one million, one hundred forty thousand, eight hundred sixty-nine".