398915269 has 2 divisors, whose sum is σ = 398915270. Its totient is φ = 398915268.

The previous prime is 398915249. The next prime is 398915303. The reversal of 398915269 is 962519893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 395492769 + 3422500 = 19887^2 + 1850^2 .

It is a cyclic number.

It is not a de Polignac number, because 398915269 - 2⁷ = 398915141 is a prime.

It is a super-2 number, since 2×398915269² = 318266783682684722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398915219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199457634 + 199457635.

It is an arithmetic number, because the mean of its divisors is an integer number (199457635).

Almost surely, 2^398915269 is an apocalyptic number.

It is an amenable number.

398915269 is a deficient number, since it is larger than the sum of its proper divisors (1).

398915269 is an equidigital number, since it uses as much as digits as its factorization.

398915269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 52.

The square root of 398915269 is about 19972.8633150082. The cubic root of 398915269 is about 736.1396662375.

The spelling of 398915269 in words is "three hundred ninety-eight million, nine hundred fifteen thousand, two hundred sixty-nine".