18194409 has 16 divisors (see below), whose sum is σ = 27399040. Its totient is φ = 11929680.

The previous prime is 18194399. The next prime is 18194413. The reversal of 18194409 is 90449181.

It is not a de Polignac number, because 18194409 - 2¹⁵ = 18161641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18194509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3877 + ... + 7170.

It is an arithmetic number, because the mean of its divisors is an integer number (1712440).

Almost surely, 2^18194409 is an apocalyptic number.

It is an amenable number.

18194409 is a deficient number, since it is larger than the sum of its proper divisors (9204631).

18194409 is a wasteful number, since it uses less digits than its factorization.

18194409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11117 (or 11111 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 18194409 is about 4265.4904759007. The cubic root of 18194409 is about 263.0142734426.

The spelling of 18194409 in words is "eighteen million, one hundred ninety-four thousand, four hundred nine".