918381 has 8 divisors (see below), whose sum is σ = 1236384. Its totient is φ = 606320.

The previous prime is 918371. The next prime is 918389. The reversal of 918381 is 183819.

918381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 918381 - 2⁹ = 917869 is a prime.

It is a super-2 number, since 2×918381² = 1686847322322, which contains 22 as substring.

It is a Curzon number.

918381 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 918381.

It is not an unprimeable number, because it can be changed into a prime (918389) 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, 1110 + ... + 1751.

It is an arithmetic number, because the mean of its divisors is an integer number (154548).

2⁹¹⁸³⁸¹ is an apocalyptic number.

It is an amenable number.

918381 is a deficient number, since it is larger than the sum of its proper divisors (318003).

918381 is a wasteful number, since it uses less digits than its factorization.

918381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2971.

The product of its digits is 1728, while the sum is 30.

The square root of 918381 is about 958.3219709471. The cubic root of 918381 is about 97.2017976263.

The spelling of 918381 in words is "nine hundred eighteen thousand, three hundred eighty-one".