398729 has 2 divisors, whose sum is σ = 398730. Its totient is φ = 398728.

The previous prime is 398711. The next prime is 398731. The reversal of 398729 is 927893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200704 + 198025 = 448^2 + 445^2 .

It is a cyclic number.

It is not a de Polignac number, because 398729 - 2⁸ = 398473 is a prime.

Together with 398731, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 398692 and 398701.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 398729.

It is not a weakly prime, because it can be changed into another prime (398759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199364 + 199365.

It is an arithmetic number, because the mean of its divisors is an integer number (199365).

2³⁹⁸⁷²⁹ is an apocalyptic number.

It is an amenable number.

398729 is a deficient number, since it is larger than the sum of its proper divisors (1).

398729 is an equidigital number, since it uses as much as digits as its factorization.

398729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 38.

The square root of 398729 is about 631.4499188376. The cubic root of 398729 is about 73.6025071019.

The spelling of 398729 in words is "three hundred ninety-eight thousand, seven hundred twenty-nine".