40367991 has 4 divisors (see below), whose sum is σ = 53823992. Its totient is φ = 26911992.

The previous prime is 40367981. The next prime is 40368001. The reversal of 40367991 is 19976304.

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

It is an interprime number because it is at equal distance from previous prime (40367981) and next prime (40368001).

It is not a de Polignac number, because 40367991 - 2¹⁵ = 40335223 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 (40367941) 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, 6727996 + ... + 6728001.

It is an arithmetic number, because the mean of its divisors is an integer number (13455998).

Almost surely, 2^40367991 is an apocalyptic number.

40367991 is a deficient number, since it is larger than the sum of its proper divisors (13456001).

40367991 is a wasteful number, since it uses less digits than its factorization.

40367991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13456000.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 40367991 is about 6353.5809587980. The cubic root of 40367991 is about 343.0407491529.

The spelling of 40367991 in words is "forty million, three hundred sixty-seven thousand, nine hundred ninety-one".