43440345 has 24 divisors (see below), whose sum is σ = 81089736. Its totient is φ = 21385728.

The previous prime is 43440323. The next prime is 43440373. The reversal of 43440345 is 54304434.

It can be written as a sum of positive squares in 4 ways, for example, as 2108304 + 41332041 = 1452^2 + 6429^2 .

It is not a de Polignac number, because 43440345 - 2¹⁶ = 43374809 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36544 + ... + 37713.

It is an arithmetic number, because the mean of its divisors is an integer number (3378739).

Almost surely, 2^43440345 is an apocalyptic number.

43440345 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

43440345 is a deficient number, since it is larger than the sum of its proper divisors (37649391).

43440345 is a wasteful number, since it uses less digits than its factorization.

43440345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74281 (or 74278 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 27.

The square root of 43440345 is about 6590.9289937004. The cubic root of 43440345 is about 351.5316413211.

Adding to 43440345 its reverse (54304434), we get a palindrome (97744779).

The spelling of 43440345 in words is "forty-three million, four hundred forty thousand, three hundred forty-five".