90381 has 8 divisors (see below), whose sum is σ = 123264. Its totient is φ = 58880.

The previous prime is 90379. The next prime is 90397. The reversal of 90381 is 18309.

90381 is nontrivially palindromic in base 2.

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 90381 - 2¹ = 90379 is a prime.

It is a super-2 number, since 2×90381² = 16337450322, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180 + ... + 461.

It is an arithmetic number, because the mean of its divisors is an integer number (15408).

2⁹⁰³⁸¹ is an apocalyptic number.

It is an amenable number.

90381 is a deficient number, since it is larger than the sum of its proper divisors (32883).

90381 is a wasteful number, since it uses less digits than its factorization.

90381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 90381 is about 300.6343293771. The cubic root of 90381 is about 44.8771960399.

The spelling of 90381 in words is "ninety thousand, three hundred eighty-one".