40720145 has 4 divisors (see below), whose sum is σ = 48864180. Its totient is φ = 32576112.

The previous prime is 40720129. The next prime is 40720153. The reversal of 40720145 is 54102704.

40720145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 27709696 + 13010449 = 5264^2 + 3607^2 .

It is a cyclic number.

It is not a de Polignac number, because 40720145 - 2⁴ = 40720129 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40720145.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4072010 + ... + 4072019.

It is an arithmetic number, because the mean of its divisors is an integer number (12216045).

Almost surely, 2^40720145 is an apocalyptic number.

It is an amenable number.

40720145 is a deficient number, since it is larger than the sum of its proper divisors (8144035).

40720145 is an equidigital number, since it uses as much as digits as its factorization.

40720145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8144034.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 40720145 is about 6381.2338148668. The cubic root of 40720145 is about 344.0353786626.

Adding to 40720145 its reverse (54102704), we get a palindrome (94822849).

The spelling of 40720145 in words is "forty million, seven hundred twenty thousand, one hundred forty-five".