18019396 has 12 divisors (see below), whose sum is σ = 32905152. Its totient is φ = 8617928.

The previous prime is 18019387. The next prime is 18019423. The reversal of 18019396 is 69391081.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97840 + ... + 98023.

It is an arithmetic number, because the mean of its divisors is an integer number (2742096).

Almost surely, 2^18019396 is an apocalyptic number.

It is an amenable number.

18019396 is a deficient number, since it is larger than the sum of its proper divisors (14885756).

18019396 is a wasteful number, since it uses less digits than its factorization.

18019396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195890 (or 195888 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 18019396 is about 4244.9259121921. The cubic root of 18019396 is about 262.1682387782.

The spelling of 18019396 in words is "eighteen million, nineteen thousand, three hundred ninety-six".