18038945 has 8 divisors (see below), whose sum is σ = 21702120. Its totient is φ = 14394240.

The previous prime is 18038897. The next prime is 18038947. The reversal of 18038945 is 54983081.

It can be written as a sum of positive squares in 4 ways, for example, as 6315169 + 11723776 = 2513^2 + 3424^2 .

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

It is not a de Polignac number, because 18038945 - 2⁸ = 18038689 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18038899 and 18038908.

It is not an unprimeable number, because it can be changed into a prime (18038947) 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, 2366 + ... + 6455.

It is an arithmetic number, because the mean of its divisors is an integer number (2712765).

Almost surely, 2^18038945 is an apocalyptic number.

It is an amenable number.

18038945 is a deficient number, since it is larger than the sum of its proper divisors (3663175).

18038945 is an equidigital number, since it uses as much as digits as its factorization.

18038945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9235.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 18038945 is about 4247.2279194788. The cubic root of 18038945 is about 262.2630121106.

The spelling of 18038945 in words is "eighteen million, thirty-eight thousand, nine hundred forty-five".