623945 has 8 divisors (see below), whose sum is σ = 855744. Its totient is φ = 427824.

The previous prime is 623933. The next prime is 623947. The reversal of 623945 is 549326.

623945 is an esthetic number in base 6, because in such base its adjacent digits differ by 1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 623945 - 2⁴ = 623929 is a prime.

It is a d-powerful number, because it can be written as 6⁷ + 2³ + 9⁵ + 3⁹ + 4⁹ + 5⁵ .

It is a Duffinian number.

It is a plaindrome in base 14.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 623945.

It is not an unprimeable number, because it can be changed into a prime (623947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8879 + ... + 8948.

It is an arithmetic number, because the mean of its divisors is an integer number (106968).

2⁶²³⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

623945 is a deficient number, since it is larger than the sum of its proper divisors (231799).

623945 is a wasteful number, since it uses less digits than its factorization.

623945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17839.

The product of its digits is 6480, while the sum is 29.

The square root of 623945 is about 789.9018926424. The cubic root of 623945 is about 85.4506629167.

The spelling of 623945 in words is "six hundred twenty-three thousand, nine hundred forty-five".