40591309 has 4 divisors (see below), whose sum is σ = 44281440. Its totient is φ = 36901180.

The previous prime is 40591289. The next prime is 40591333. The reversal of 40591309 is 90319504.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40591309 - 2¹⁵ = 40558541 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40591009) 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, 1845049 + ... + 1845070.

It is an arithmetic number, because the mean of its divisors is an integer number (11070360).

Almost surely, 2^40591309 is an apocalyptic number.

It is an amenable number.

40591309 is a deficient number, since it is larger than the sum of its proper divisors (3690131).

40591309 is a wasteful number, since it uses less digits than its factorization.

40591309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3690130.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 40591309 is about 6371.1309043215. The cubic root of 40591309 is about 343.6721598294.

The spelling of 40591309 in words is "forty million, five hundred ninety-one thousand, three hundred nine".