40421065 has 4 divisors (see below), whose sum is σ = 48505284. Its totient is φ = 32336848.

The previous prime is 40421047. The next prime is 40421071. The reversal of 40421065 is 56012404.

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 11648569 + 28772496 = 3413^2 + 5364^2 .

It is a cyclic number.

It is not a de Polignac number, because 40421065 - 2⁷ = 40420937 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, 4042102 + ... + 4042111.

It is an arithmetic number, because the mean of its divisors is an integer number (12126321).

Almost surely, 2^40421065 is an apocalyptic number.

It is an amenable number.

40421065 is a deficient number, since it is larger than the sum of its proper divisors (8084219).

40421065 is an equidigital number, since it uses as much as digits as its factorization.

40421065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8084218.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 40421065 is about 6357.7562866156. The cubic root of 40421065 is about 343.1910214442.

Adding to 40421065 its reverse (56012404), we get a palindrome (96433469).

The spelling of 40421065 in words is "forty million, four hundred twenty-one thousand, sixty-five".