623981723 has 4 divisors (see below), whose sum is σ = 624041160. Its totient is φ = 623922288.

The previous prime is 623981713. The next prime is 623981731. The reversal of 623981723 is 327189326.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 327189326 = 2 ⋅163594663.

It is a cyclic number.

It is not a de Polignac number, because 623981723 - 2²⁸ = 355546267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (623981713) 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, 9290 + ... + 36527.

It is an arithmetic number, because the mean of its divisors is an integer number (156010290).

Almost surely, 2^623981723 is an apocalyptic number.

623981723 is a deficient number, since it is larger than the sum of its proper divisors (59437).

623981723 is a wasteful number, since it uses less digits than its factorization.

623981723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59436.

The product of its digits is 108864, while the sum is 41.

The square root of 623981723 is about 24979.6261581314. The cubic root of 623981723 is about 854.5233931617.

The spelling of 623981723 in words is "six hundred twenty-three million, nine hundred eighty-one thousand, seven hundred twenty-three".