18143719 has 4 divisors (see below), whose sum is σ = 19793160. Its totient is φ = 16494280.

The previous prime is 18143701. The next prime is 18143729. The reversal of 18143719 is 91734181.

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

It is not a de Polignac number, because 18143719 - 2⁵ = 18143687 is a prime.

It is a super-2 number, since 2×18143719² = 658389078301922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18143729) 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, 824704 + ... + 824725.

It is an arithmetic number, because the mean of its divisors is an integer number (4948290).

Almost surely, 2^18143719 is an apocalyptic number.

18143719 is a deficient number, since it is larger than the sum of its proper divisors (1649441).

18143719 is a wasteful number, since it uses less digits than its factorization.

18143719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1649440.

The product of its digits is 6048, while the sum is 34.

The square root of 18143719 is about 4259.5444592116. The cubic root of 18143719 is about 262.7697918553.

The spelling of 18143719 in words is "eighteen million, one hundred forty-three thousand, seven hundred nineteen".