40644919 has 8 divisors (see below), whose sum is σ = 46496160. Its totient is φ = 34804896.

The previous prime is 40644917. The next prime is 40644931. The reversal of 40644919 is 91944604.

40644919 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40644919 - 2¹ = 40644917 is a prime.

It is a super-2 number, since 2×40644919² = 3304018881033122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40644911) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 7497 + ... + 11725.

It is an arithmetic number, because the mean of its divisors is an integer number (5812020).

Almost surely, 2^40644919 is an apocalyptic number.

40644919 is a deficient number, since it is larger than the sum of its proper divisors (5851241).

40644919 is a wasteful number, since it uses less digits than its factorization.

40644919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5609.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 40644919 is about 6375.3367754182. The cubic root of 40644919 is about 343.8233921971.

The spelling of 40644919 in words is "forty million, six hundred forty-four thousand, nine hundred nineteen".