398623 has 4 divisors (see below), whose sum is σ = 401320. Its totient is φ = 395928.

The previous prime is 398621. The next prime is 398627. The reversal of 398623 is 326893.

It is a happy number.

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 398623 - 2¹ = 398621 is a prime.

It is a super-2 number, since 2×398623² = 317800592258, which contains 22 as substring.

It is a Duffinian number.

398623 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398621) 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, 1113 + ... + 1426.

It is an arithmetic number, because the mean of its divisors is an integer number (100330).

2³⁹⁸⁶²³ is an apocalyptic number.

398623 is a deficient number, since it is larger than the sum of its proper divisors (2697).

398623 is a wasteful number, since it uses less digits than its factorization.

398623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2696.

The product of its digits is 7776, while the sum is 31.

The square root of 398623 is about 631.3659794446. The cubic root of 398623 is about 73.5959842445.

The spelling of 398623 in words is "three hundred ninety-eight thousand, six hundred twenty-three".