9393981 has 4 divisors (see below), whose sum is σ = 12525312. Its totient is φ = 6262652.

The previous prime is 9393977. The next prime is 9393991. The reversal of 9393981 is 1893939.

It is a happy number.

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 9393981 - 2² = 9393977 is a prime.

It is a super-2 number, since 2×9393981² = 176493758056722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9393991) 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, 1565661 + ... + 1565666.

It is an arithmetic number, because the mean of its divisors is an integer number (3131328).

Almost surely, 2^9393981 is an apocalyptic number.

It is an amenable number.

9393981 is a deficient number, since it is larger than the sum of its proper divisors (3131331).

9393981 is a wasteful number, since it uses less digits than its factorization.

9393981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3131330.

The product of its digits is 52488, while the sum is 42.

The square root of 9393981 is about 3064.9601955001. The cubic root of 9393981 is about 211.0003743545. Note that the first 3 decimals are identical.

Subtracting from 9393981 its sum of digits (42), we obtain a palindrome (9393939).

The spelling of 9393981 in words is "nine million, three hundred ninety-three thousand, nine hundred eighty-one".