18219436 has 12 divisors (see below), whose sum is σ = 32424840. Its totient is φ = 8955200.

The previous prime is 18219433. The next prime is 18219437. The reversal of 18219436 is 63491281.

It is not an unprimeable number, because it can be changed into a prime (18219433) 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, 38365 + ... + 38836.

It is an arithmetic number, because the mean of its divisors is an integer number (2702070).

Almost surely, 2^18219436 is an apocalyptic number.

It is an amenable number.

18219436 is a deficient number, since it is larger than the sum of its proper divisors (14205404).

18219436 is a wasteful number, since it uses less digits than its factorization.

18219436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77264 (or 77262 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The square root of 18219436 is about 4268.4231280415. The cubic root of 18219436 is about 263.1348130801.

The spelling of 18219436 in words is "eighteen million, two hundred nineteen thousand, four hundred thirty-six".