40445891 has 8 divisors (see below), whose sum is σ = 42314784. Its totient is φ = 38586240.

The previous prime is 40445887. The next prime is 40445903. The reversal of 40445891 is 19854404.

It is a happy number.

40445891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 40445891 - 2² = 40445887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40445831) 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, 7595 + ... + 11771.

It is an arithmetic number, because the mean of its divisors is an integer number (5289348).

Almost surely, 2^40445891 is an apocalyptic number.

40445891 is a deficient number, since it is larger than the sum of its proper divisors (1868893).

40445891 is a wasteful number, since it uses less digits than its factorization.

40445891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4621.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 40445891 is about 6359.7084052651. The cubic root of 40445891 is about 343.2612679571.

The spelling of 40445891 in words is "forty million, four hundred forty-five thousand, eight hundred ninety-one".