105720623 has 4 divisors (see below), whose sum is σ = 106111008. Its totient is φ = 105330240.

The previous prime is 105720613. The next prime is 105720649. The reversal of 105720623 is 326027501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326027501 = 9041 ⋅36061.

It is a cyclic number.

It is not a de Polignac number, because 105720623 - 2¹⁰ = 105719599 is a prime.

It is a super-3 number, since 3×105720623³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 105720592 and 105720601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105720613) 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, 194786 + ... + 195327.

It is an arithmetic number, because the mean of its divisors is an integer number (26527752).

Almost surely, 2^105720623 is an apocalyptic number.

105720623 is a deficient number, since it is larger than the sum of its proper divisors (390385).

105720623 is an equidigital number, since it uses as much as digits as its factorization.

105720623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390384.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 105720623 is about 10282.0534427710. The cubic root of 105720623 is about 472.8462014888.

The spelling of 105720623 in words is "one hundred five million, seven hundred twenty thousand, six hundred twenty-three".