398969 has 2 divisors, whose sum is σ = 398970. Its totient is φ = 398968.

The previous prime is 398941. The next prime is 398977. The reversal of 398969 is 969893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 354025 + 44944 = 595^2 + 212^2 .

It is a cyclic number.

It is not a de Polignac number, because 398969 - 2¹⁶ = 333433 is a prime.

It is a super-2 number, since 2×398969² = 318352525922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (398989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199484 + 199485.

It is an arithmetic number, because the mean of its divisors is an integer number (199485).

2³⁹⁸⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

398969 is a deficient number, since it is larger than the sum of its proper divisors (1).

398969 is an equidigital number, since it uses as much as digits as its factorization.

398969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 44.

The square root of 398969 is about 631.6399290735. The cubic root of 398969 is about 73.6172715649.

The spelling of 398969 in words is "three hundred ninety-eight thousand, nine hundred sixty-nine".