40091663 has 4 divisors (see below), whose sum is σ = 40106280. Its totient is φ = 40077048.

The previous prime is 40091657. The next prime is 40091671. The reversal of 40091663 is 36619004.

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 40091663 - 2¹⁴ = 40075279 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 (40091963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1820 + ... + 9137.

It is an arithmetic number, because the mean of its divisors is an integer number (10026570).

Almost surely, 2^40091663 is an apocalyptic number.

40091663 is a deficient number, since it is larger than the sum of its proper divisors (14617).

40091663 is a wasteful number, since it uses less digits than its factorization.

40091663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14616.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 40091663 is about 6331.7977699860. The cubic root of 40091663 is about 342.2562259171.

The spelling of 40091663 in words is "forty million, ninety-one thousand, six hundred sixty-three".