18469381 has 8 divisors (see below), whose sum is σ = 21263040. Its totient is φ = 15714528.

The previous prime is 18469379. The next prime is 18469411. The reversal of 18469381 is 18396481.

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 18469381 - 2¹ = 18469379 is a prime.

It is a super-2 number, since 2×18469381² = 682236069046322, 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 (18469351) 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, 8671 + ... + 10588.

It is an arithmetic number, because the mean of its divisors is an integer number (2657880).

Almost surely, 2^18469381 is an apocalyptic number.

It is an amenable number.

18469381 is a deficient number, since it is larger than the sum of its proper divisors (2793659).

18469381 is a wasteful number, since it uses less digits than its factorization.

18469381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19403.

The product of its digits is 41472, while the sum is 40.

The square root of 18469381 is about 4297.6017730823. The cubic root of 18469381 is about 264.3326318736.

Subtracting from 18469381 its reverse (18396481), we obtain a square (72900 = 270²).

The spelling of 18469381 in words is "eighteen million, four hundred sixty-nine thousand, three hundred eighty-one".