398070331 has 2 divisors, whose sum is σ = 398070332. Its totient is φ = 398070330.

The previous prime is 398070319. The next prime is 398070341. The reversal of 398070331 is 133070893.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 398070331 - 2¹¹ = 398068283 is a prime.

It is a super-2 number, since 2×398070331² = 316919976844899122, which contains 22 as substring.

It is equal to p_21238819 and since 398070331 and 21238819 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (398070301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199035165 + 199035166.

It is an arithmetic number, because the mean of its divisors is an integer number (199035166).

Almost surely, 2^398070331 is an apocalyptic number.

398070331 is a deficient number, since it is larger than the sum of its proper divisors (1).

398070331 is an equidigital number, since it uses as much as digits as its factorization.

398070331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 398070331 is about 19951.6999526356. The cubic root of 398070331 is about 735.6195624392.

The spelling of 398070331 in words is "three hundred ninety-eight million, seventy thousand, three hundred thirty-one".