623993 has 4 divisors (see below), whose sum is σ = 645540. Its totient is φ = 602448.

The previous prime is 623989. The next prime is 624007. The reversal of 623993 is 399326.

623993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 273529 + 350464 = 523^2 + 592^2 .

It is a cyclic number.

It is not a de Polignac number, because 623993 - 2² = 623989 is a prime.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (623923) 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, 10730 + ... + 10787.

It is an arithmetic number, because the mean of its divisors is an integer number (161385).

2⁶²³⁹⁹³ is an apocalyptic number.

It is an amenable number.

623993 is a deficient number, since it is larger than the sum of its proper divisors (21547).

623993 is a wasteful number, since it uses less digits than its factorization.

623993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21546.

The product of its digits is 8748, while the sum is 32.

The square root of 623993 is about 789.9322755781. The cubic root of 623993 is about 85.4528540963.

The spelling of 623993 in words is "six hundred twenty-three thousand, nine hundred ninety-three".