398447 has 4 divisors (see below), whose sum is σ = 455376. Its totient is φ = 341520.

The previous prime is 398441. The next prime is 398459. The reversal of 398447 is 744893.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 398447 - 2¹⁸ = 136303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 398447.

It is not an unprimeable number, because it can be changed into a prime (398441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28454 + ... + 28467.

It is an arithmetic number, because the mean of its divisors is an integer number (113844).

2³⁹⁸⁴⁴⁷ is an apocalyptic number.

398447 is a deficient number, since it is larger than the sum of its proper divisors (56929).

398447 is an equidigital number, since it uses as much as digits as its factorization.

398447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56928.

The product of its digits is 24192, while the sum is 35.

The square root of 398447 is about 631.2265837241. The cubic root of 398447 is about 73.5851512854.

It can be divided in two parts, 398 and 447, that multiplied together give a triangular number (177906 = T₅₉₆).

The spelling of 398447 in words is "three hundred ninety-eight thousand, four hundred forty-seven".