623321993 has 12 divisors (see below), whose sum is σ = 735305472. Its totient is φ = 526748040.

The previous prime is 623321957. The next prime is 623322001. The reversal of 623321993 is 399123326.

It is not a de Polignac number, because 623321993 - 2¹⁸ = 623059849 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (623321953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86105 + ... + 93062.

It is an arithmetic number, because the mean of its divisors is an integer number (61275456).

Almost surely, 2^623321993 is an apocalyptic number.

It is an amenable number.

623321993 is a deficient number, since it is larger than the sum of its proper divisors (111983479).

623321993 is a wasteful number, since it uses less digits than its factorization.

623321993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179252 (or 179245 counting only the distinct ones).

The product of its digits is 52488, while the sum is 38.

The square root of 623321993 is about 24966.4173040507. The cubic root of 623321993 is about 854.2221271158. Note that the first 3 decimals are identical.

The spelling of 623321993 in words is "six hundred twenty-three million, three hundred twenty-one thousand, nine hundred ninety-three".