43440613 has 4 divisors (see below), whose sum is σ = 43630540. Its totient is φ = 43250688.

The previous prime is 43440581. The next prime is 43440619. The reversal of 43440613 is 31604434.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35784324 + 7656289 = 5982^2 + 2767^2 .

It is a cyclic number.

It is not a de Polignac number, because 43440613 - 2⁵ = 43440581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43440619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94620 + ... + 95077.

It is an arithmetic number, because the mean of its divisors is an integer number (10907635).

Almost surely, 2^43440613 is an apocalyptic number.

It is an amenable number.

43440613 is a deficient number, since it is larger than the sum of its proper divisors (189927).

43440613 is a wasteful number, since it uses less digits than its factorization.

43440613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189926.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 43440613 is about 6590.9493246421. The cubic root of 43440613 is about 351.5323642303.

The spelling of 43440613 in words is "forty-three million, four hundred forty thousand, six hundred thirteen".