18394789 has 8 divisors (see below), whose sum is σ = 21240128. Its totient is φ = 15603840.

The previous prime is 18394781. The next prime is 18394837. The reversal of 18394789 is 98749381.

It is a happy number.

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

It is not a de Polignac number, because 18394789 - 2³ = 18394781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18394781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12867 + ... + 14224.

It is an arithmetic number, because the mean of its divisors is an integer number (2655016).

Almost surely, 2^18394789 is an apocalyptic number.

It is an amenable number.

18394789 is a deficient number, since it is larger than the sum of its proper divisors (2845339).

18394789 is an equidigital number, since it uses as much as digits as its factorization.

18394789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27195.

The product of its digits is 435456, while the sum is 49.

The square root of 18394789 is about 4288.9146645742. The cubic root of 18394789 is about 263.9762997166.

The spelling of 18394789 in words is "eighteen million, three hundred ninety-four thousand, seven hundred eighty-nine".