18723345 has 16 divisors (see below), whose sum is σ = 30082752. Its totient is φ = 9944000.

The previous prime is 18723337. The next prime is 18723371. The reversal of 18723345 is 54332781.

It is not a de Polignac number, because 18723345 - 2³ = 18723337 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1279 + ... + 6251.

It is an arithmetic number, because the mean of its divisors is an integer number (1880172).

Almost surely, 2^18723345 is an apocalyptic number.

18723345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18723345 is a deficient number, since it is larger than the sum of its proper divisors (11359407).

18723345 is a wasteful number, since it uses less digits than its factorization.

18723345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5232.

The product of its digits is 20160, while the sum is 33.

The square root of 18723345 is about 4327.0480699895. The cubic root of 18723345 is about 265.5386929751.

It can be divided in two parts, 187 and 23345, that added together give a palindrome (23532).

The spelling of 18723345 in words is "eighteen million, seven hundred twenty-three thousand, three hundred forty-five".