18947097 has 18 divisors (see below), whose sum is σ = 29637582. Its totient is φ = 11658816.

The previous prime is 18947087. The next prime is 18947099. The reversal of 18947097 is 79074981.

It can be written as a sum of positive squares in 3 ways, for example, as 594441 + 18352656 = 771^2 + 4284^2 .

It is not a de Polignac number, because 18947097 - 2²⁰ = 17898521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18947099) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4708 + ... + 7749.

Almost surely, 2^18947097 is an apocalyptic number.

It is an amenable number.

18947097 is a deficient number, since it is larger than the sum of its proper divisors (10690485).

18947097 is a wasteful number, since it uses less digits than its factorization.

18947097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12489 (or 12473 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 18947097 is about 4352.8263232066. The cubic root of 18947097 is about 266.5922742138.

The spelling of 18947097 in words is "eighteen million, nine hundred forty-seven thousand, ninety-seven".