18923645 has 16 divisors (see below), whose sum is σ = 24554880. Its totient is φ = 13917504.

The previous prime is 18923629. The next prime is 18923651. The reversal of 18923645 is 54632981.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18923645 - 2⁴ = 18923629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18923599 and 18923608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22136 + ... + 22974.

It is an arithmetic number, because the mean of its divisors is an integer number (1534680).

Almost surely, 2^18923645 is an apocalyptic number.

It is an amenable number.

18923645 is a deficient number, since it is larger than the sum of its proper divisors (5631235).

18923645 is a wasteful number, since it uses less digits than its factorization.

18923645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1204.

The product of its digits is 51840, while the sum is 38.

The square root of 18923645 is about 4350.1316072045. The cubic root of 18923645 is about 266.4822361899.

The spelling of 18923645 in words is "eighteen million, nine hundred twenty-three thousand, six hundred forty-five".