9940181 has 8 divisors (see below), whose sum is σ = 10500864. Its totient is φ = 9394560.

The previous prime is 9940129. The next prime is 9940199. The reversal of 9940181 is 1810499.

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 9940181 - 2¹⁸ = 9678037 is a prime.

It is a super-2 number, since 2×9940181² = 197614396625522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9940111) 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, 2396 + ... + 5061.

It is an arithmetic number, because the mean of its divisors is an integer number (1312608).

Almost surely, 2^9940181 is an apocalyptic number.

It is an amenable number.

9940181 is a deficient number, since it is larger than the sum of its proper divisors (560683).

9940181 is a wasteful number, since it uses less digits than its factorization.

9940181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7531.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 9940181 is about 3152.8052588132. The cubic root of 9940181 is about 215.0130224670.

The spelling of 9940181 in words is "nine million, nine hundred forty thousand, one hundred eighty-one".