43440493 has 2 divisors, whose sum is σ = 43440494. Its totient is φ = 43440492.

The previous prime is 43440451. The next prime is 43440511. The reversal of 43440493 is 39404434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37785609 + 5654884 = 6147^2 + 2378^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43440493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43440413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21720246 + 21720247.

It is an arithmetic number, because the mean of its divisors is an integer number (21720247).

Almost surely, 2^43440493 is an apocalyptic number.

It is an amenable number.

43440493 is a deficient number, since it is larger than the sum of its proper divisors (1).

43440493 is an equidigital number, since it uses as much as digits as its factorization.

43440493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 43440493 is about 6590.9402212431. The cubic root of 43440493 is about 351.5320405400.

The spelling of 43440493 in words is "forty-three million, four hundred forty thousand, four hundred ninety-three".