623917 has 16 divisors (see below), whose sum is σ = 777600. Its totient is φ = 498624.

The previous prime is 623893. The next prime is 623923. The reversal of 623917 is 719326.

It is not a de Polignac number, because 623917 - 2¹¹ = 621869 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 5778 + ... + 5884.

It is an arithmetic number, because the mean of its divisors is an integer number (48600).

2⁶²³⁹¹⁷ is an apocalyptic number.

It is an amenable number.

623917 is a deficient number, since it is larger than the sum of its proper divisors (153683).

623917 is a wasteful number, since it uses less digits than its factorization.

623917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145 (or 131 counting only the distinct ones).

The product of its digits is 2268, while the sum is 28.

The square root of 623917 is about 789.8841687235. The cubic root of 623917 is about 85.4493846767.

It can be divided in two parts, 623 and 917, that added together give a triangular number (1540 = T₅₅).

The spelling of 623917 in words is "six hundred twenty-three thousand, nine hundred seventeen".