18124381 has 8 divisors (see below), whose sum is σ = 20096928. Its totient is φ = 16206000.

The previous prime is 18124373. The next prime is 18124433. The reversal of 18124381 is 18342181.

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 18124381 - 2³ = 18124373 is a prime.

It is a super-2 number, since 2×18124381² = 656986373266322, 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 (18124321) 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, 12835 + ... + 14176.

It is an arithmetic number, because the mean of its divisors is an integer number (2512116).

Almost surely, 2^18124381 is an apocalyptic number.

18124381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18124381 is a deficient number, since it is larger than the sum of its proper divisors (1972547).

18124381 is a wasteful number, since it uses less digits than its factorization.

18124381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27083.

The product of its digits is 1536, while the sum is 28.

The square root of 18124381 is about 4257.2738929977. The cubic root of 18124381 is about 262.6764032725.

The spelling of 18124381 in words is "eighteen million, one hundred twenty-four thousand, three hundred eighty-one".