18181934 has 8 divisors (see below), whose sum is σ = 28152768. Its totient is φ = 8797680.

The previous prime is 18181931. The next prime is 18181949. The reversal of 18181934 is 43918181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 18181894 and 18181903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18181931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146567 + ... + 146690.

It is an arithmetic number, because the mean of its divisors is an integer number (3519096).

Almost surely, 2^18181934 is an apocalyptic number.

18181934 is a deficient number, since it is larger than the sum of its proper divisors (9970834).

18181934 is a wasteful number, since it uses less digits than its factorization.

18181934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293290.

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

The square root of 18181934 is about 4264.0279079762. The cubic root of 18181934 is about 262.9541477699.

The spelling of 18181934 in words is "eighteen million, one hundred eighty-one thousand, nine hundred thirty-four".