9940491 has 48 divisors (see below), whose sum is σ = 16773120. Its totient is φ = 5616000.

The previous prime is 9940471. The next prime is 9940501. The reversal of 9940491 is 1940499.

It is not a de Polignac number, because 9940491 - 2¹⁷ = 9809419 is a prime.

It is a super-2 number, since 2×9940491² = 197626722642162, which contains 22 as substring.

9940491 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9940451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 125790 + ... + 125868.

It is an arithmetic number, because the mean of its divisors is an integer number (349440).

Almost surely, 2^9940491 is an apocalyptic number.

9940491 is a deficient number, since it is larger than the sum of its proper divisors (6832629).

9940491 is a wasteful number, since it uses less digits than its factorization.

9940491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 9940491 is about 3152.8544209969. The cubic root of 9940491 is about 215.0152576156.

The spelling of 9940491 in words is "nine million, nine hundred forty thousand, four hundred ninety-one".