40320791 has 8 divisors (see below), whose sum is σ = 46156704. Its totient is φ = 34503840.

The previous prime is 40320781. The next prime is 40320803. The reversal of 40320791 is 19702304.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-40320791 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40320791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40320751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161 + ... + 8981.

It is an arithmetic number, because the mean of its divisors is an integer number (5769588).

Almost surely, 2^40320791 is an apocalyptic number.

40320791 is a deficient number, since it is larger than the sum of its proper divisors (5835913).

40320791 is an equidigital number, since it uses as much as digits as its factorization.

40320791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9481.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 40320791 is about 6349.8654316450. The cubic root of 40320791 is about 342.9069976527.

The spelling of 40320791 in words is "forty million, three hundred twenty thousand, seven hundred ninety-one".