398245356869 has 2 divisors, whose sum is σ = 398245356870. Its totient is φ = 398245356868.

The previous prime is 398245356863. The next prime is 398245356907. The reversal of 398245356869 is 968653542893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 392830604644 + 5414752225 = 626762^2 + 73585^2 .

It is an emirp because it is prime and its reverse (968653542893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 398245356869 - 2⁴ = 398245356853 is a prime.

It is a super-2 number, since 2×398245356869² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 398245356799 and 398245356808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398245356863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199122678434 + 199122678435.

It is an arithmetic number, because the mean of its divisors is an integer number (199122678435).

Almost surely, 2^398245356869 is an apocalyptic number.

It is an amenable number.

398245356869 is a deficient number, since it is larger than the sum of its proper divisors (1).

398245356869 is an equidigital number, since it uses as much as digits as its factorization.

398245356869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 335923200, while the sum is 68.

The spelling of 398245356869 in words is "three hundred ninety-eight billion, two hundred forty-five million, three hundred fifty-six thousand, eight hundred sixty-nine".