18698947 has 4 divisors (see below), whose sum is σ = 18728496. Its totient is φ = 18669400.

The previous prime is 18698941. The next prime is 18698951. The reversal of 18698947 is 74989681.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18698947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18698894 and 18698903.

It is not an unprimeable number, because it can be changed into a prime (18698941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13804 + ... + 15097.

It is an arithmetic number, because the mean of its divisors is an integer number (4682124).

Almost surely, 2^18698947 is an apocalyptic number.

18698947 is a deficient number, since it is larger than the sum of its proper divisors (29549).

18698947 is an equidigital number, since it uses as much as digits as its factorization.

18698947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29548.

The product of its digits is 870912, while the sum is 52.

The square root of 18698947 is about 4324.2279079623. The cubic root of 18698947 is about 265.4233035309.

It can be divided in two parts, 1869 and 8947, that added together give a square (10816 = 104²).

The spelling of 18698947 in words is "eighteen million, six hundred ninety-eight thousand, nine hundred forty-seven".