18196669 has 4 divisors (see below), whose sum is σ = 18224860. Its totient is φ = 18168480.

The previous prime is 18196667. The next prime is 18196679. The reversal of 18196669 is 96669181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96669181 = 7 ⋅13809883.

It can be written as a sum of positive squares in 2 ways, for example, as 10562500 + 7634169 = 3250^2 + 2763^2 .

It is a cyclic number.

It is not a de Polignac number, because 18196669 - 2¹ = 18196667 is a prime.

It is a super-2 number, since 2×18196669² = 662237525391122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18196667) 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, 13104 + ... + 14425.

It is an arithmetic number, because the mean of its divisors is an integer number (4556215).

Almost surely, 2^18196669 is an apocalyptic number.

It is an amenable number.

18196669 is a deficient number, since it is larger than the sum of its proper divisors (28191).

18196669 is an equidigital number, since it uses as much as digits as its factorization.

18196669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28190.

The product of its digits is 139968, while the sum is 46.

The square root of 18196669 is about 4265.7553844542. The cubic root of 18196669 is about 263.0251630085.

The spelling of 18196669 in words is "eighteen million, one hundred ninety-six thousand, six hundred sixty-nine".