40448565 has 44 divisors (see below), whose sum is σ = 73338444. Its totient is φ = 21415104.

The previous prime is 40448563. The next prime is 40448579. The reversal of 40448565 is 56584404.

It can be written as a sum of positive squares in 2 ways, for example, as 19131876 + 21316689 = 4374^2 + 4617^2 .

It is not a de Polignac number, because 40448565 - 2¹ = 40448563 is a prime.

It is a plaindrome in base 12.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40448563) by changing a digit.

It is a polite number, since it can be written in 43 ways as a sum of consecutive naturals, for example, 295177 + ... + 295313.

Almost surely, 2^40448565 is an apocalyptic number.

40448565 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40448565 is a deficient number, since it is larger than the sum of its proper divisors (32889879).

40448565 is an frugal number, since it uses more digits than its factorization.

40448565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

The square root of 40448565 is about 6359.9186315550. The cubic root of 40448565 is about 343.2688324701.

It can be divided in two parts, 404485 and 65, that added together give a triangular number (404550 = T₈₉₉).

The spelling of 40448565 in words is "forty million, four hundred forty-eight thousand, five hundred sixty-five".