18019429 has 4 divisors (see below), whose sum is σ = 18967840. Its totient is φ = 17071020.

The previous prime is 18019427. The next prime is 18019453. The reversal of 18019429 is 92491081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18019429 - 2¹ = 18019427 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18019394 and 18019403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18019423) 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, 474177 + ... + 474214.

It is an arithmetic number, because the mean of its divisors is an integer number (4741960).

Almost surely, 2^18019429 is an apocalyptic number.

18019429 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18019429 is a deficient number, since it is larger than the sum of its proper divisors (948411).

18019429 is an equidigital number, since it uses as much as digits as its factorization.

18019429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948410.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 18019429 is about 4244.9297991840. The cubic root of 18019429 is about 262.1683988196.

The spelling of 18019429 in words is "eighteen million, nineteen thousand, four hundred twenty-nine".