18913853 has 6 divisors (see below), whose sum is σ = 22001886. Its totient is φ = 16211832.

The previous prime is 18913849. The next prime is 18913861. The reversal of 18913853 is 35831981.

It can be written as a sum of positive squares in only one way, i.e., 12945604 + 5968249 = 3598^2 + 2443^2 .

It is not a de Polignac number, because 18913853 - 2² = 18913849 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18913823) 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 5 ways as a sum of consecutive naturals, for example, 192950 + ... + 193047.

It is an arithmetic number, because the mean of its divisors is an integer number (3666981).

Almost surely, 2^18913853 is an apocalyptic number.

It is an amenable number.

18913853 is a deficient number, since it is larger than the sum of its proper divisors (3088033).

18913853 is an equidigital number, since it uses as much as digits as its factorization.

18913853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386011 (or 386004 counting only the distinct ones).

The product of its digits is 25920, while the sum is 38.

The square root of 18913853 is about 4349.0059783817. The cubic root of 18913853 is about 266.4362647036.

The spelling of 18913853 in words is "eighteen million, nine hundred thirteen thousand, eight hundred fifty-three".