390198869 has 2 divisors, whose sum is σ = 390198870. Its totient is φ = 390198868.

The previous prime is 390198847. The next prime is 390198871. The reversal of 390198869 is 968891093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 259371025 + 130827844 = 16105^2 + 11438^2 .

It is a cyclic number.

It is not a de Polignac number, because 390198869 - 2¹⁶ = 390133333 is a prime.

It is a super-2 number, since 2×390198869² = 304510314737758322, which contains 22 as substring.

Together with 390198871, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 390198869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390198169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195099434 + 195099435.

It is an arithmetic number, because the mean of its divisors is an integer number (195099435).

Almost surely, 2^390198869 is an apocalyptic number.

It is an amenable number.

390198869 is a deficient number, since it is larger than the sum of its proper divisors (1).

390198869 is an equidigital number, since it uses as much as digits as its factorization.

390198869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 839808, while the sum is 53.

The square root of 390198869 is about 19753.4520780546. The cubic root of 390198869 is about 730.7385213867.

The spelling of 390198869 in words is "three hundred ninety million, one hundred ninety-eight thousand, eight hundred sixty-nine".