623965 has 4 divisors (see below), whose sum is σ = 748764. Its totient is φ = 499168.

The previous prime is 623963. The next prime is 623977. The reversal of 623965 is 569326.

623965 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 196249 + 427716 = 443^2 + 654^2 .

It is a cyclic number.

It is not a de Polignac number, because 623965 - 2¹ = 623963 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623963) 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, 62392 + ... + 62401.

It is an arithmetic number, because the mean of its divisors is an integer number (187191).

2⁶²³⁹⁶⁵ is an apocalyptic number.

It is an amenable number.

623965 is a deficient number, since it is larger than the sum of its proper divisors (124799).

623965 is a wasteful number, since it uses less digits than its factorization.

623965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124798.

The product of its digits is 9720, while the sum is 31.

The square root of 623965 is about 789.9145523409. The cubic root of 623965 is about 85.4515759219.

The spelling of 623965 in words is "six hundred twenty-three thousand, nine hundred sixty-five".