18975813 has 16 divisors (see below), whose sum is σ = 27494400. Its totient is φ = 11597040.

The previous prime is 18975811. The next prime is 18975821. The reversal of 18975813 is 31857981.

It is not a de Polignac number, because 18975813 - 2¹ = 18975811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18975811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3603 + ... + 7136.

It is an arithmetic number, because the mean of its divisors is an integer number (1718400).

Almost surely, 2^18975813 is an apocalyptic number.

It is an amenable number.

18975813 is a deficient number, since it is larger than the sum of its proper divisors (8518587).

18975813 is a wasteful number, since it uses less digits than its factorization.

18975813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10792.

The product of its digits is 60480, while the sum is 42.

The square root of 18975813 is about 4356.1236208354. The cubic root of 18975813 is about 266.7268876146.

The spelling of 18975813 in words is "eighteen million, nine hundred seventy-five thousand, eight hundred thirteen".