9999381 has 12 divisors (see below), whose sum is σ = 15509472. Its totient is φ = 5713848.

The previous prime is 9999347. The next prime is 9999397. The reversal of 9999381 is 1839999.

It is not a de Polignac number, because 9999381 - 2⁶ = 9999317 is a prime.

It is a super-2 number, since 2×9999381² = 199975240766322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9999381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33865 + ... + 34158.

It is an arithmetic number, because the mean of its divisors is an integer number (1292456).

Almost surely, 2^9999381 is an apocalyptic number.

It is an amenable number.

9999381 is a deficient number, since it is larger than the sum of its proper divisors (5510091).

9999381 is a wasteful number, since it uses less digits than its factorization.

9999381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68040 (or 68033 counting only the distinct ones).

The product of its digits is 157464, while the sum is 48.

The square root of 9999381 is about 3162.1797861602. The cubic root of 9999381 is about 215.4390235946.

The spelling of 9999381 in words is "nine million, nine hundred ninety-nine thousand, three hundred eighty-one".