40368991 has 4 divisors (see below), whose sum is σ = 43474312. Its totient is φ = 37263672.

The previous prime is 40368989. The next prime is 40369003. The reversal of 40368991 is 19986304.

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

It is a cyclic number.

It is not a de Polignac number, because 40368991 - 2¹ = 40368989 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 (40362991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1552641 + ... + 1552666.

It is an arithmetic number, because the mean of its divisors is an integer number (10868578).

Almost surely, 2^40368991 is an apocalyptic number.

40368991 is a deficient number, since it is larger than the sum of its proper divisors (3105321).

40368991 is a wasteful number, since it uses less digits than its factorization.

40368991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3105320.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 40368991 is about 6353.6596540891. The cubic root of 40368991 is about 343.0435817431.

The spelling of 40368991 in words is "forty million, three hundred sixty-eight thousand, nine hundred ninety-one".