18678969 has 12 divisors (see below), whose sum is σ = 27710436. Its totient is φ = 12115872.

The previous prime is 18678931. The next prime is 18678973. The reversal of 18678969 is 96987681.

It can be written as a sum of positive squares in 2 ways, for example, as 10810944 + 7868025 = 3288^2 + 2805^2 .

It is not a de Polignac number, because 18678969 - 2⁷ = 18678841 is a prime.

It is a super-2 number, since 2×18678969² = 697807765805922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18678269) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 27714 + ... + 28379.

It is an arithmetic number, because the mean of its divisors is an integer number (2309203).

Almost surely, 2^18678969 is an apocalyptic number.

It is an amenable number.

18678969 is a deficient number, since it is larger than the sum of its proper divisors (9031467).

18678969 is a wasteful number, since it uses less digits than its factorization.

18678969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56136 (or 56133 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 18678969 is about 4321.9172828734. The cubic root of 18678969 is about 265.3287435480.

The spelling of 18678969 in words is "eighteen million, six hundred seventy-eight thousand, nine hundred sixty-nine".