18309419 has 4 divisors (see below), whose sum is σ = 18336240. Its totient is φ = 18282600.

The previous prime is 18309397. The next prime is 18309439. The reversal of 18309419 is 91490381.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18309419 - 2¹² = 18305323 is a prime.

It is a super-2 number, since 2×18309419² = 670469648235122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18309439) 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, 12359 + ... + 13760.

It is an arithmetic number, because the mean of its divisors is an integer number (4584060).

Almost surely, 2^18309419 is an apocalyptic number.

18309419 is a deficient number, since it is larger than the sum of its proper divisors (26821).

18309419 is an equidigital number, since it uses as much as digits as its factorization.

18309419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26820.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 18309419 is about 4278.9506891293. The cubic root of 18309419 is about 263.5672960318.

The spelling of 18309419 in words is "eighteen million, three hundred nine thousand, four hundred nineteen".