40385891 has 16 divisors (see below), whose sum is σ = 50313984. Its totient is φ = 31562784.

The previous prime is 40385869. The next prime is 40385899. The reversal of 40385891 is 19858304.

40385891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 40385891 - 2¹⁴ = 40369507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40385899) 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 15 ways as a sum of consecutive naturals, for example, 4880 + ... + 10226.

It is an arithmetic number, because the mean of its divisors is an integer number (3144624).

Almost surely, 2^40385891 is an apocalyptic number.

40385891 is a deficient number, since it is larger than the sum of its proper divisors (9928093).

40385891 is a wasteful number, since it uses less digits than its factorization.

40385891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5450.

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

The square root of 40385891 is about 6354.9894571116. The cubic root of 40385891 is about 343.0914454421.

The spelling of 40385891 in words is "forty million, three hundred eighty-five thousand, eight hundred ninety-one".