40791865 has 4 divisors (see below), whose sum is σ = 48950244. Its totient is φ = 32633488.

The previous prime is 40791827. The next prime is 40791869. The reversal of 40791865 is 56819704.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10969344 + 29822521 = 3312^2 + 5461^2 .

It is a cyclic number.

It is not a de Polignac number, because 40791865 - 2¹⁵ = 40759097 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40791869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4079182 + ... + 4079191.

It is an arithmetic number, because the mean of its divisors is an integer number (12237561).

Almost surely, 2^40791865 is an apocalyptic number.

It is an amenable number.

40791865 is a deficient number, since it is larger than the sum of its proper divisors (8158379).

40791865 is an equidigital number, since it uses as much as digits as its factorization.

40791865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8158378.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 40791865 is about 6386.8509454973. The cubic root of 40791865 is about 344.2372422640.

The spelling of 40791865 in words is "forty million, seven hundred ninety-one thousand, eight hundred sixty-five".