398723 has 4 divisors (see below), whose sum is σ = 429408. Its totient is φ = 368040.

The previous prime is 398711. The next prime is 398729. The reversal of 398723 is 327893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 327893 = 131 ⋅2503.

It is a cyclic number.

It is not a de Polignac number, because 398723 - 2⁸ = 398467 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 398723.

It is not an unprimeable number, because it can be changed into a prime (398729) 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, 15323 + ... + 15348.

It is an arithmetic number, because the mean of its divisors is an integer number (107352).

2³⁹⁸⁷²³ is an apocalyptic number.

398723 is a deficient number, since it is larger than the sum of its proper divisors (30685).

398723 is a wasteful number, since it uses less digits than its factorization.

398723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30684.

The product of its digits is 9072, while the sum is 32.

The square root of 398723 is about 631.4451678491. The cubic root of 398723 is about 73.6021379144.

The spelling of 398723 in words is "three hundred ninety-eight thousand, seven hundred twenty-three".