18514381 has 8 divisors (see below), whose sum is σ = 19350144. Its totient is φ = 17697120.

The previous prime is 18514373. The next prime is 18514387. The reversal of 18514381 is 18341581.

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 18514381 - 2³ = 18514373 is a prime.

It is a super-2 number, since 2×18514381² = 685564607626322, 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 (18514387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2560 + ... + 6601.

It is an arithmetic number, because the mean of its divisors is an integer number (2418768).

Almost surely, 2^18514381 is an apocalyptic number.

It is an amenable number.

18514381 is a deficient number, since it is larger than the sum of its proper divisors (835763).

18514381 is an equidigital number, since it uses as much as digits as its factorization.

18514381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9251.

The product of its digits is 3840, while the sum is 31.

The square root of 18514381 is about 4302.8340660546. The cubic root of 18514381 is about 264.5471368233.

The spelling of 18514381 in words is "eighteen million, five hundred fourteen thousand, three hundred eighty-one".