40445013 has 16 divisors (see below), whose sum is σ = 62642816. Its totient is φ = 22731840.

The previous prime is 40445011. The next prime is 40445021. The reversal of 40445013 is 31054404.

It is not a de Polignac number, because 40445013 - 2¹ = 40445011 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40445011) 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 15 ways as a sum of consecutive naturals, for example, 14506 + ... + 17067.

It is an arithmetic number, because the mean of its divisors is an integer number (3915176).

Almost surely, 2^40445013 is an apocalyptic number.

It is an amenable number.

40445013 is a deficient number, since it is larger than the sum of its proper divisors (22197803).

40445013 is a wasteful number, since it uses less digits than its factorization.

40445013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31644.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 40445013 is about 6359.6393765685. The cubic root of 40445013 is about 343.2587840989.

Adding to 40445013 its reverse (31054404), we get a palindrome (71499417).

The spelling of 40445013 in words is "forty million, four hundred forty-five thousand, thirteen".