40045361 has 4 divisors (see below), whose sum is σ = 40119924. Its totient is φ = 39970800.

The previous prime is 40045321. The next prime is 40045381. The reversal of 40045361 is 16354004.

It is a happy number.

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 13830961 + 26214400 = 3719^2 + 5120^2 .

It is a cyclic number.

It is not a de Polignac number, because 40045361 - 2¹⁰ = 40044337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40045301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36470 + ... + 37551.

It is an arithmetic number, because the mean of its divisors is an integer number (10029981).

Almost surely, 2^40045361 is an apocalyptic number.

It is an amenable number.

40045361 is a deficient number, since it is larger than the sum of its proper divisors (74563).

40045361 is an equidigital number, since it uses as much as digits as its factorization.

40045361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74562.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 40045361 is about 6328.1404061541. The cubic root of 40045361 is about 342.1244175298.

Adding to 40045361 its reverse (16354004), we get a palindrome (56399365).

The spelling of 40045361 in words is "forty million, forty-five thousand, three hundred sixty-one".