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18258529 = 42732

18258529 has 3 divisors (see below), whose sum is σ = 18262803. Its totient is φ = 18254256.

The previous prime is 18258517. The next prime is 18258547. The reversal of 18258529 is 92585281.

The square root of 18258529 is 4273.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 4950625 + 13307904 = 2225^2 + 3648^2 .

It is not a de Polignac number, because 18258529 - 25 = 18258497 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18258491 and 18258500.

It is not an unprimeable number, because it can be changed into a prime (18258509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2137 + ... + 6409.

It is an arithmetic number, because the mean of its divisors is an integer number (6087601).

Almost surely, 218258529 is an apocalyptic number.

18258529 is the 4273-rd square number.

18258529 is the 2137-th centered octagonal number.

It is an amenable number.

18258529 is a deficient number, since it is larger than the sum of its proper divisors (4274).

18258529 is an frugal number, since it uses more digits than its factorization.

18258529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8546 (or 4273 counting only the distinct ones).

The product of its digits is 57600, while the sum is 40.

The cubic root of 18258529 is about 263.3228792873.

Multiplying 18258529 by its product of digits (57600), we get a square (1051691270400 = 10255202).

The spelling of 18258529 in words is "eighteen million, two hundred fifty-eight thousand, five hundred twenty-nine".

Divisors: 1 4273 18258529