18947475 has 18 divisors (see below), whose sum is σ = 33937436. Its totient is φ = 10105200.

The previous prime is 18947459. The next prime is 18947483. The reversal of 18947475 is 57474981.

It is a happy number.

It is not a de Polignac number, because 18947475 - 2⁴ = 18947459 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18947475.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 41881 + ... + 42330.

Almost surely, 2^18947475 is an apocalyptic number.

18947475 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18947475 is a deficient number, since it is larger than the sum of its proper divisors (14989961).

18947475 is a wasteful number, since it uses less digits than its factorization.

18947475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84227 (or 84219 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 18947475 is about 4352.8697430546. The cubic root of 18947475 is about 266.5940470660.

The spelling of 18947475 in words is "eighteen million, nine hundred forty-seven thousand, four hundred seventy-five".