40042865 has 4 divisors (see below), whose sum is σ = 48051444. Its totient is φ = 32034288.

The previous prime is 40042853. The next prime is 40042883. The reversal of 40042865 is 56824004.

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 5550736 + 34492129 = 2356^2 + 5873^2 .

It is a cyclic number.

It is not a de Polignac number, because 40042865 - 2¹² = 40038769 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4004282 + ... + 4004291.

It is an arithmetic number, because the mean of its divisors is an integer number (12012861).

Almost surely, 2^40042865 is an apocalyptic number.

It is an amenable number.

40042865 is a deficient number, since it is larger than the sum of its proper divisors (8008579).

40042865 is an equidigital number, since it uses as much as digits as its factorization.

40042865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8008578.

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 40042865 is about 6327.9431887462. The cubic root of 40042865 is about 342.1173092551.

Adding to 40042865 its reverse (56824004), we get a palindrome (96866869).

The spelling of 40042865 in words is "forty million, forty-two thousand, eight hundred sixty-five".