40581389 has 8 divisors (see below), whose sum is σ = 40939320. Its totient is φ = 40225536.

The previous prime is 40581337. The next prime is 40581403. The reversal of 40581389 is 98318504.

40581389 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 4489 + 40576900 = 67^2 + 6370^2 .

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 40581389 - 2⁸ = 40581133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40580389) 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, 99017 + ... + 99425.

It is an arithmetic number, because the mean of its divisors is an integer number (5117415).

Almost surely, 2^40581389 is an apocalyptic number.

It is an amenable number.

40581389 is a deficient number, since it is larger than the sum of its proper divisors (357931).

40581389 is a wasteful number, since it uses less digits than its factorization.

40581389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1039.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 40581389 is about 6370.3523450434. The cubic root of 40581389 is about 343.6441611792.

The spelling of 40581389 in words is "forty million, five hundred eighty-one thousand, three hundred eighty-nine".