18938853 has 20 divisors (see below), whose sum is σ = 28762668. Its totient is φ = 12415680.

The previous prime is 18938851. The next prime is 18938863. The reversal of 18938853 is 35883981.

It can be written as a sum of positive squares in 2 ways, for example, as 2022084 + 16916769 = 1422^2 + 4113^2 .

It is not a de Polignac number, because 18938853 - 2¹ = 18938851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18938799 and 18938808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18938851) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3025 + ... + 6857.

Almost surely, 2^18938853 is an apocalyptic number.

It is an amenable number.

18938853 is a deficient number, since it is larger than the sum of its proper divisors (9823815).

18938853 is an equidigital number, since it uses as much as digits as its factorization.

18938853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3906 (or 3897 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 18938853 is about 4351.8792492439. The cubic root of 18938853 is about 266.5536032846.

It can be divided in two parts, 18938 and 853, that added together give a palindrome (19791).

The spelling of 18938853 in words is "eighteen million, nine hundred thirty-eight thousand, eight hundred fifty-three".