18811394 has 12 divisors (see below), whose sum is σ = 32824134. Its totient is φ = 8061984.

The previous prime is 18811393. The next prime is 18811409. The reversal of 18811394 is 49311881.

It can be written as a sum of positive squares in only one way, i.e., 12496225 + 6315169 = 3535^2 + 2513^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18811391) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 95879 + ... + 96074.

Almost surely, 2^18811394 is an apocalyptic number.

18811394 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18811394 is a deficient number, since it is larger than the sum of its proper divisors (14012740).

18811394 is a wasteful number, since it uses less digits than its factorization.

18811394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191969 (or 191962 counting only the distinct ones).

The product of its digits is 6912, while the sum is 35.

The square root of 18811394 is about 4337.2103937900. The cubic root of 18811394 is about 265.9542857729.

The spelling of 18811394 in words is "eighteen million, eight hundred eleven thousand, three hundred ninety-four".