9943381 has 4 divisors (see below), whose sum is σ = 11363872. Its totient is φ = 8522892.

The previous prime is 9943379. The next prime is 9943387. The reversal of 9943381 is 1833499.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1833499 = 127 ⋅14437.

It is not a de Polignac number, because 9943381 - 2¹ = 9943379 is a prime.

It is a super-2 number, since 2×9943381² = 197741651422322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9943381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9943387) 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, 710235 + ... + 710248.

It is an arithmetic number, because the mean of its divisors is an integer number (2840968).

Almost surely, 2^9943381 is an apocalyptic number.

It is an amenable number.

9943381 is a deficient number, since it is larger than the sum of its proper divisors (1420491).

9943381 is a wasteful number, since it uses less digits than its factorization.

9943381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1420490.

The product of its digits is 23328, while the sum is 37.

The square root of 9943381 is about 3153.3127025400. The cubic root of 9943381 is about 215.0360927328.

The spelling of 9943381 in words is "nine million, nine hundred forty-three thousand, three hundred eighty-one".