993381 has 4 divisors (see below), whose sum is σ = 1324512. Its totient is φ = 662252.

The previous prime is 993367. The next prime is 993397. The reversal of 993381 is 183399.

993381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 993381 - 2⁷ = 993253 is a prime.

It is a super-2 number, since 2×993381² = 1973611622322, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (993341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165561 + ... + 165566.

It is an arithmetic number, because the mean of its divisors is an integer number (331128).

2⁹⁹³³⁸¹ is an apocalyptic number.

It is an amenable number.

993381 is a deficient number, since it is larger than the sum of its proper divisors (331131).

993381 is a wasteful number, since it uses less digits than its factorization.

993381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331130.

The product of its digits is 5832, while the sum is 33.

The square root of 993381 is about 996.6850054054. The cubic root of 993381 is about 99.7788780780.

The spelling of 993381 in words is "nine hundred ninety-three thousand, three hundred eighty-one".