18229237 has 4 divisors (see below), whose sum is σ = 19631500. Its totient is φ = 16826976.

The previous prime is 18229229. The next prime is 18229241. The reversal of 18229237 is 73292281.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9696996 + 8532241 = 3114^2 + 2921^2 .

It is a cyclic number.

It is not a de Polignac number, because 18229237 - 2³ = 18229229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18229217) 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, 701112 + ... + 701137.

It is an arithmetic number, because the mean of its divisors is an integer number (4907875).

Almost surely, 2^18229237 is an apocalyptic number.

It is an amenable number.

18229237 is a deficient number, since it is larger than the sum of its proper divisors (1402263).

18229237 is a wasteful number, since it uses less digits than its factorization.

18229237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402262.

The product of its digits is 12096, while the sum is 34.

The square root of 18229237 is about 4269.5710557385. The cubic root of 18229237 is about 263.1819883786.

It can be divided in two parts, 182292 and 37, that added together give a square (182329 = 427²).

The spelling of 18229237 in words is "eighteen million, two hundred twenty-nine thousand, two hundred thirty-seven".