40891289 has 4 divisors (see below), whose sum is σ = 41561700. Its totient is φ = 40220880.

The previous prime is 40891271. The next prime is 40891303. The reversal of 40891289 is 98219804.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22401289 + 18490000 = 4733^2 + 4300^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40891289 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40891219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335114 + ... + 335235.

It is an arithmetic number, because the mean of its divisors is an integer number (10390425).

Almost surely, 2^40891289 is an apocalyptic number.

It is an amenable number.

40891289 is a deficient number, since it is larger than the sum of its proper divisors (670411).

40891289 is an equidigital number, since it uses as much as digits as its factorization.

40891289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670410.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 40891289 is about 6394.6296999905. The cubic root of 40891289 is about 344.5166907498.

The spelling of 40891289 in words is "forty million, eight hundred ninety-one thousand, two hundred eighty-nine".