398261 has 2 divisors, whose sum is σ = 398262. Its totient is φ = 398260.

The previous prime is 398249. The next prime is 398267. The reversal of 398261 is 162893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 398161 + 100 = 631^2 + 10^2 .

It is a cyclic number.

It is not a de Polignac number, because 398261 - 2¹⁰ = 397237 is a prime.

It is a super-2 number, since 2×398261² = 317223648242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199130 + 199131.

It is an arithmetic number, because the mean of its divisors is an integer number (199131).

2³⁹⁸²⁶¹ is an apocalyptic number.

It is an amenable number.

398261 is a deficient number, since it is larger than the sum of its proper divisors (1).

398261 is an equidigital number, since it uses as much as digits as its factorization.

398261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 29.

The square root of 398261 is about 631.0792343280. The cubic root of 398261 is about 73.5736993495.

The spelling of 398261 in words is "three hundred ninety-eight thousand, two hundred sixty-one".