40491331 has 8 divisors (see below), whose sum is σ = 42930000. Its totient is φ = 38059008.

The previous prime is 40491317. The next prime is 40491343. The reversal of 40491331 is 13319404.

It is a happy number.

40491331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 40491331 - 2⁹ = 40490819 is a prime.

It is a super-2 number, since 2×40491331² = 3279095772303122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40491296 and 40491305.

It is not an unprimeable number, because it can be changed into a prime (40491391) 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 7 ways as a sum of consecutive naturals, for example, 20280 + ... + 22186.

It is an arithmetic number, because the mean of its divisors is an integer number (5366250).

Almost surely, 2^40491331 is an apocalyptic number.

40491331 is a deficient number, since it is larger than the sum of its proper divisors (2438669).

40491331 is a wasteful number, since it uses less digits than its factorization.

40491331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3173.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 40491331 is about 6363.2798932626. The cubic root of 40491331 is about 343.3897684798.

The spelling of 40491331 in words is "forty million, four hundred ninety-one thousand, three hundred thirty-one".