17938945 has 8 divisors (see below), whose sum is σ = 22659840. Its totient is φ = 13595760.

The previous prime is 17938939. The next prime is 17938979. The reversal of 17938945 is 54983971.

It is a happy number.

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

It is not a de Polignac number, because 17938945 - 2³ = 17938937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 17938895 and 17938904.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94321 + ... + 94510.

It is an arithmetic number, because the mean of its divisors is an integer number (2832480).

Almost surely, 2^17938945 is an apocalyptic number.

It is an amenable number.

17938945 is a deficient number, since it is larger than the sum of its proper divisors (4720895).

17938945 is a wasteful number, since it uses less digits than its factorization.

17938945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188855.

The product of its digits is 272160, while the sum is 46.

The square root of 17938945 is about 4235.4391743950. The cubic root of 17938945 is about 261.7774901212. Note that the first 3 decimals are identical.

The spelling of 17938945 in words is "seventeen million, nine hundred thirty-eight thousand, nine hundred forty-five".