18147769 has 2 divisors, whose sum is σ = 18147770. Its totient is φ = 18147768.

The previous prime is 18147757. The next prime is 18147839. The reversal of 18147769 is 96774181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18147600 + 169 = 4260^2 + 13^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18147769 is a prime.

It is a super-2 number, since 2×18147769² = 658683039354722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18147709) 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 as a sum of consecutive naturals, namely, 9073884 + 9073885.

It is an arithmetic number, because the mean of its divisors is an integer number (9073885).

Almost surely, 2^18147769 is an apocalyptic number.

It is an amenable number.

18147769 is a deficient number, since it is larger than the sum of its proper divisors (1).

18147769 is an equidigital number, since it uses as much as digits as its factorization.

18147769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 43.

The square root of 18147769 is about 4260.0198356346. The cubic root of 18147769 is about 262.7893420273.

The spelling of 18147769 in words is "eighteen million, one hundred forty-seven thousand, seven hundred sixty-nine".