9918381 has 8 divisors (see below), whose sum is σ = 14426784. Its totient is φ = 6011120.

The previous prime is 9918379. The next prime is 9918383. The reversal of 9918381 is 1838199.

It is a happy number.

9918381 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (9918379) and next prime (9918383).

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 9918381 - 2¹ = 9918379 is a prime.

It is a super-2 number, since 2×9918381² = 196748563322322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9918383) 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, 150246 + ... + 150311.

It is an arithmetic number, because the mean of its divisors is an integer number (1803348).

Almost surely, 2^9918381 is an apocalyptic number.

It is an amenable number.

9918381 is a deficient number, since it is larger than the sum of its proper divisors (4508403).

9918381 is a wasteful number, since it uses less digits than its factorization.

9918381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300571.

The product of its digits is 15552, while the sum is 39.

The square root of 9918381 is about 3149.3461226102. The cubic root of 9918381 is about 214.8557243702.

The spelling of 9918381 in words is "nine million, nine hundred eighteen thousand, three hundred eighty-one".