18644069 has 8 divisors (see below), whose sum is σ = 19157952. Its totient is φ = 18133920.

The previous prime is 18644063. The next prime is 18644107. The reversal of 18644069 is 96044681.

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

It is a cyclic number.

It is not a de Polignac number, because 18644069 - 2⁸ = 18643813 is a prime.

It is a super-2 number, since 2×18644069² = 695202617753522, 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 (18644063) 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 7 ways as a sum of consecutive naturals, for example, 11312 + ... + 12854.

It is an arithmetic number, because the mean of its divisors is an integer number (2394744).

Almost surely, 2^18644069 is an apocalyptic number.

It is an amenable number.

18644069 is a deficient number, since it is larger than the sum of its proper divisors (513883).

18644069 is a wasteful number, since it uses less digits than its factorization.

18644069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1867.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 18644069 is about 4317.8778352334. The cubic root of 18644069 is about 265.1633927678.

The spelling of 18644069 in words is "eighteen million, six hundred forty-four thousand, sixty-nine".