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18268909 = 139131431
BaseRepresentation
bin100010110110…
…0001011101101
31021101011020021
41011230023231
514134101114
61451322141
7311166061
oct105541355
937334207
1018268909
11a34877a
126150351
133a28509
1425d7aa1
15190d024
hex116c2ed

18268909 has 4 divisors (see below), whose sum is σ = 18400480. Its totient is φ = 18137340.

The previous prime is 18268891. The next prime is 18268963. The reversal of 18268909 is 90986281.

It is a happy number.

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 18268909 - 27 = 18268781 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 (18268979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65577 + ... + 65854.

It is an arithmetic number, because the mean of its divisors is an integer number (4600120).

Almost surely, 218268909 is an apocalyptic number.

It is an amenable number.

18268909 is a deficient number, since it is larger than the sum of its proper divisors (131571).

18268909 is a wasteful number, since it uses less digits than its factorization.

18268909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131570.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 18268909 is about 4274.2144307463. The cubic root of 18268909 is about 263.3727696461.

The spelling of 18268909 in words is "eighteen million, two hundred sixty-eight thousand, nine hundred nine".

Divisors: 1 139 131431 18268909