623789 has 4 divisors (see below), whose sum is σ = 656640. Its totient is φ = 590940.

The previous prime is 623771. The next prime is 623803. The reversal of 623789 is 987326.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 623789 - 2¹² = 619693 is a prime.

It is a super-2 number, since 2×623789² = 778225433042, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623719) 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, 16397 + ... + 16434.

It is an arithmetic number, because the mean of its divisors is an integer number (164160).

2⁶²³⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

623789 is a deficient number, since it is larger than the sum of its proper divisors (32851).

623789 is a wasteful number, since it uses less digits than its factorization.

623789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32850.

The product of its digits is 18144, while the sum is 35.

The square root of 623789 is about 789.8031400292. The cubic root of 623789 is about 85.4435408069.

The spelling of 623789 in words is "six hundred twenty-three thousand, seven hundred eighty-nine".