18143225 has 12 divisors (see below), whose sum is σ = 22923756. Its totient is φ = 14239680.

The previous prime is 18143173. The next prime is 18143227. The reversal of 18143225 is 52234181.

It can be written as a sum of positive squares in 6 ways, for example, as 2111209 + 16032016 = 1453^2 + 4004^2 .

It is not a de Polignac number, because 18143225 - 2²⁴ = 1366009 is a prime.

It is a super-2 number, since 2×18143225² = 658353226801250, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18143194 and 18143203.

It is not an unprimeable number, because it can be changed into a prime (18143227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5522 + ... + 8171.

It is an arithmetic number, because the mean of its divisors is an integer number (1910313).

Almost surely, 2^18143225 is an apocalyptic number.

It is an amenable number.

18143225 is a deficient number, since it is larger than the sum of its proper divisors (4780531).

18143225 is a wasteful number, since it uses less digits than its factorization.

18143225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13756 (or 13751 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

The square root of 18143225 is about 4259.4864713953. The cubic root of 18143225 is about 262.7674070180.

The spelling of 18143225 in words is "eighteen million, one hundred forty-three thousand, two hundred twenty-five".