18336381 has 16 divisors (see below), whose sum is σ = 28905600. Its totient is φ = 10116288.

The previous prime is 18336377. The next prime is 18336391. The reversal of 18336381 is 18363381.

It is a happy number.

It is not a de Polignac number, because 18336381 - 2² = 18336377 is a prime.

It is a super-2 number, since 2×18336381² = 672445736354322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18336301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14446 + ... + 15663.

It is an arithmetic number, because the mean of its divisors is an integer number (1806600).

Almost surely, 2^18336381 is an apocalyptic number.

It is an amenable number.

18336381 is a deficient number, since it is larger than the sum of its proper divisors (10569219).

18336381 is a wasteful number, since it uses less digits than its factorization.

18336381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30148.

The product of its digits is 10368, while the sum is 33.

The square root of 18336381 is about 4282.1000688914. The cubic root of 18336381 is about 263.6966068180.

Subtracting 18336381 from its reverse (18363381), we obtain a cube (27000 = 30³).

The spelling of 18336381 in words is "eighteen million, three hundred thirty-six thousand, three hundred eighty-one".