398800069 has 2 divisors, whose sum is σ = 398800070. Its totient is φ = 398800068.

The previous prime is 398800033. The next prime is 398800081. The reversal of 398800069 is 960008893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 397204900 + 1595169 = 19930^2 + 1263^2 .

It is an emirp because it is prime and its reverse (960008893) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398800069 is a prime.

It is a super-2 number, since 2×398800069² = 318082990068809522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 398799998 and 398800034.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398800009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199400034 + 199400035.

It is an arithmetic number, because the mean of its divisors is an integer number (199400035).

Almost surely, 2^398800069 is an apocalyptic number.

It is an amenable number.

398800069 is a deficient number, since it is larger than the sum of its proper divisors (1).

398800069 is an equidigital number, since it uses as much as digits as its factorization.

398800069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 398800069 is about 19969.9791937798. The cubic root of 398800069 is about 736.0687978429.

The spelling of 398800069 in words is "three hundred ninety-eight million, eight hundred thousand, sixty-nine".