18442669 has 12 divisors (see below), whose sum is σ = 21699900. Its totient is φ = 15626688.

The previous prime is 18442667. The next prime is 18442693. The reversal of 18442669 is 96624481.

It can be written as a sum of positive squares in 2 ways, for example, as 12744900 + 5697769 = 3570^2 + 2387^2 .

It is not a de Polignac number, because 18442669 - 2¹ = 18442667 is a prime.

It is a super-2 number, since 2×18442669² = 680264079687122, 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 (18442663) 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 11 ways as a sum of consecutive naturals, for example, 2247 + ... + 6475.

It is an arithmetic number, because the mean of its divisors is an integer number (1808325).

Almost surely, 2^18442669 is an apocalyptic number.

It is an amenable number.

18442669 is a deficient number, since it is larger than the sum of its proper divisors (3257231).

18442669 is an equidigital number, since it uses as much as digits as its factorization.

18442669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4332 (or 4325 counting only the distinct ones).

The product of its digits is 82944, while the sum is 40.

The square root of 18442669 is about 4294.4928687797. The cubic root of 18442669 is about 264.2051368950.

The spelling of 18442669 in words is "eighteen million, four hundred forty-two thousand, six hundred sixty-nine".