18949473 has 6 divisors (see below), whose sum is σ = 27371474. Its totient is φ = 12632976.

The previous prime is 18949471. The next prime is 18949487. The reversal of 18949473 is 37494981.

It can be written as a sum of positive squares in only one way, i.e., 13417569 + 5531904 = 3663^2 + 2352^2 .

It is not a de Polignac number, because 18949473 - 2¹ = 18949471 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18949471) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1052740 + ... + 1052757.

Almost surely, 2^18949473 is an apocalyptic number.

It is an amenable number.

18949473 is a deficient number, since it is larger than the sum of its proper divisors (8422001).

18949473 is a wasteful number, since it uses less digits than its factorization.

18949473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2105503 (or 2105500 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 18949473 is about 4353.0992407709. The cubic root of 18949473 is about 266.6034174647.

The spelling of 18949473 in words is "eighteen million, nine hundred forty-nine thousand, four hundred seventy-three".