43664693 has 2 divisors, whose sum is σ = 43664694. Its totient is φ = 43664692.

The previous prime is 43664689. The next prime is 43664707. The reversal of 43664693 is 39646634.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21921124 + 21743569 = 4682^2 + 4663^2 .

It is a cyclic number.

It is not a de Polignac number, because 43664693 - 2² = 43664689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43664693.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43667693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21832346 + 21832347.

It is an arithmetic number, because the mean of its divisors is an integer number (21832347).

Almost surely, 2^43664693 is an apocalyptic number.

It is an amenable number.

43664693 is a deficient number, since it is larger than the sum of its proper divisors (1).

43664693 is an equidigital number, since it uses as much as digits as its factorization.

43664693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 41.

The square root of 43664693 is about 6607.9265280419. The cubic root of 43664693 is about 352.1357651438.

The spelling of 43664693 in words is "forty-three million, six hundred sixty-four thousand, six hundred ninety-three".