40091439 has 4 divisors (see below), whose sum is σ = 53455256. Its totient is φ = 26727624.

The previous prime is 40091413. The next prime is 40091449. The reversal of 40091439 is 93419004.

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

It is not a de Polignac number, because 40091439 - 2¹⁷ = 39960367 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 (40091449) 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, 6681904 + ... + 6681909.

It is an arithmetic number, because the mean of its divisors is an integer number (13363814).

Almost surely, 2^40091439 is an apocalyptic number.

40091439 is a deficient number, since it is larger than the sum of its proper divisors (13363817).

40091439 is a wasteful number, since it uses less digits than its factorization.

40091439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13363816.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 40091439 is about 6331.7800814621. The cubic root of 40091439 is about 342.2555884983.

The spelling of 40091439 in words is "forty million, ninety-one thousand, four hundred thirty-nine".