40645344 has 24 divisors (see below), whose sum is σ = 106694280. Its totient is φ = 13548416.

The previous prime is 40645343. The next prime is 40645357. The reversal of 40645344 is 44354604.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40645343) 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, 211599 + ... + 211790.

It is an arithmetic number, because the mean of its divisors is an integer number (4445595).

Almost surely, 2^40645344 is an apocalyptic number.

It is an amenable number.

40645344 is an abundant number, since it is smaller than the sum of its proper divisors (66048936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40645344 is a wasteful number, since it uses less digits than its factorization.

40645344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423402 (or 423394 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 30.

The square root of 40645344 is about 6375.3701069036. The cubic root of 40645344 is about 343.8245905792.

Adding to 40645344 its reverse (44354604), we get a palindrome (84999948).

The spelling of 40645344 in words is "forty million, six hundred forty-five thousand, three hundred forty-four".