18891952 has 20 divisors (see below), whose sum is σ = 36746656. Its totient is φ = 9408960.

The previous prime is 18891919. The next prime is 18891953. The reversal of 18891952 is 25919881.

It is a junction number, because it is equal to n+sod(n) for n = 18891899 and 18891908.

It is not an unprimeable number, because it can be changed into a prime (18891953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2158 + ... + 6514.

Almost surely, 2^18891952 is an apocalyptic number.

It is an amenable number.

18891952 is a deficient number, since it is larger than the sum of its proper divisors (17854704).

18891952 is a wasteful number, since it uses less digits than its factorization.

18891952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4636 (or 4630 counting only the distinct ones).

The product of its digits is 51840, while the sum is 43.

The square root of 18891952 is about 4346.4873173633. The cubic root of 18891952 is about 266.3333864173. Note that the first 4 decimals are identical.

The spelling of 18891952 in words is "eighteen million, eight hundred ninety-one thousand, nine hundred fifty-two".