40991329 has 8 divisors (see below), whose sum is σ = 41771880. Its totient is φ = 40214400.

The previous prime is 40991323. The next prime is 40991333. The reversal of 40991329 is 92319904.

40991329 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 960400 + 40030929 = 980^2 + 6327^2 .

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 40991329 - 2⁷ = 40991201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40991323) 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, 34119 + ... + 35299.

It is an arithmetic number, because the mean of its divisors is an integer number (5221485).

Almost surely, 2^40991329 is an apocalyptic number.

It is an amenable number.

40991329 is a deficient number, since it is larger than the sum of its proper divisors (780551).

40991329 is a wasteful number, since it uses less digits than its factorization.

40991329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1811.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 40991329 is about 6402.4471102853. The cubic root of 40991329 is about 344.7974137946.

The spelling of 40991329 in words is "forty million, nine hundred ninety-one thousand, three hundred twenty-nine".