40505891 has 8 divisors (see below), whose sum is σ = 43338000. Its totient is φ = 37743840.

The previous prime is 40505873. The next prime is 40505893. The reversal of 40505891 is 19850504.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40505891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40505893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16316 + ... + 18633.

It is an arithmetic number, because the mean of its divisors is an integer number (5417250).

Almost surely, 2^40505891 is an apocalyptic number.

40505891 is a deficient number, since it is larger than the sum of its proper divisors (2832109).

40505891 is a wasteful number, since it uses less digits than its factorization.

40505891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35029.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 40505891 is about 6364.4238545213. The cubic root of 40505891 is about 343.4309226047.

The spelling of 40505891 in words is "forty million, five hundred five thousand, eight hundred ninety-one".