398743 has 4 divisors (see below), whose sum is σ = 401128. Its totient is φ = 396360.

The previous prime is 398731. The next prime is 398759. The reversal of 398743 is 347893.

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 398743 - 2⁵ = 398711 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 398699 and 398708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398143) 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, 921 + ... + 1282.

It is an arithmetic number, because the mean of its divisors is an integer number (100282).

2³⁹⁸⁷⁴³ is an apocalyptic number.

398743 is a deficient number, since it is larger than the sum of its proper divisors (2385).

398743 is a wasteful number, since it uses less digits than its factorization.

398743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2384.

The product of its digits is 18144, while the sum is 34.

The square root of 398743 is about 631.4610043384. The cubic root of 398743 is about 73.6033685249.

The spelling of 398743 in words is "three hundred ninety-eight thousand, seven hundred forty-three".