18618945 has 8 divisors (see below), whose sum is σ = 29790336. Its totient is φ = 9930096.

The previous prime is 18618923. The next prime is 18618947. The reversal of 18618945 is 54981681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18618945 - 2¹⁸ = 18356801 is a prime.

It is a super-2 number, since 2×18618945² = 693330225826050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18618897 and 18618906.

It is not an unprimeable number, because it can be changed into a prime (18618947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 620617 + ... + 620646.

It is an arithmetic number, because the mean of its divisors is an integer number (3723792).

Almost surely, 2^18618945 is an apocalyptic number.

18618945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18618945 is a deficient number, since it is larger than the sum of its proper divisors (11171391).

18618945 is a wasteful number, since it uses less digits than its factorization.

18618945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241271.

The product of its digits is 69120, while the sum is 42.

The square root of 18618945 is about 4314.9675549186. The cubic root of 18618945 is about 265.0442313733.

The spelling of 18618945 in words is "eighteen million, six hundred eighteen thousand, nine hundred forty-five".