18421669 has 8 divisors (see below), whose sum is σ = 21567168. Its totient is φ = 15404640.

The previous prime is 18421639. The next prime is 18421681. The reversal of 18421669 is 96612481.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18421669 is a prime.

It is a super-2 number, since 2×18421669² = 678715777491122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18421609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31807 + ... + 32380.

It is an arithmetic number, because the mean of its divisors is an integer number (2695896).

Almost surely, 2^18421669 is an apocalyptic number.

It is an amenable number.

18421669 is a deficient number, since it is larger than the sum of its proper divisors (3145499).

18421669 is an equidigital number, since it uses as much as digits as its factorization.

18421669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64235.

The product of its digits is 20736, while the sum is 37.

The square root of 18421669 is about 4292.0471805422. The cubic root of 18421669 is about 264.1048185319.

The spelling of 18421669 in words is "eighteen million, four hundred twenty-one thousand, six hundred sixty-nine".