43664493 has 4 divisors (see below), whose sum is σ = 58219328. Its totient is φ = 29109660.

The previous prime is 43664441. The next prime is 43664497. The reversal of 43664493 is 39446634.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 43664493 - 2⁶ = 43664429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43664497) 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, 7277413 + ... + 7277418.

It is an arithmetic number, because the mean of its divisors is an integer number (14554832).

Almost surely, 2^43664493 is an apocalyptic number.

It is an amenable number.

43664493 is a deficient number, since it is larger than the sum of its proper divisors (14554835).

43664493 is a wasteful number, since it uses less digits than its factorization.

43664493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14554834.

The product of its digits is 186624, while the sum is 39.

The square root of 43664493 is about 6607.9113946844. The cubic root of 43664493 is about 352.1352275068.

The spelling of 43664493 in words is "forty-three million, six hundred sixty-four thousand, four hundred ninety-three".