18478669 has 8 divisors (see below), whose sum is σ = 20489760. Its totient is φ = 16522800.

The previous prime is 18478619. The next prime is 18478679. The reversal of 18478669 is 96687481.

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 18478669 - 2⁹ = 18478157 is a prime.

It is a super-2 number, since 2×18478669² = 682922416023122, 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 (18478619) 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, 13099 + ... + 14440.

It is an arithmetic number, because the mean of its divisors is an integer number (2561220).

Almost surely, 2^18478669 is an apocalyptic number.

It is an amenable number.

18478669 is a deficient number, since it is larger than the sum of its proper divisors (2011091).

18478669 is a wasteful number, since it uses less digits than its factorization.

18478669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27611.

The product of its digits is 580608, while the sum is 49.

The square root of 18478669 is about 4298.6822399428. The cubic root of 18478669 is about 264.3769342074.

The spelling of 18478669 in words is "eighteen million, four hundred seventy-eight thousand, six hundred sixty-nine".