43664494 has 4 divisors (see below), whose sum is σ = 65496744. Its totient is φ = 21832246.

The previous prime is 43664441. The next prime is 43664497. The reversal of 43664494 is 49446634.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49446634 = 2 ⋅24723317.

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 as a sum of consecutive naturals, namely, 10916122 + ... + 10916125.

It is an arithmetic number, because the mean of its divisors is an integer number (16374186).

Almost surely, 2^43664494 is an apocalyptic number.

43664494 is a deficient number, since it is larger than the sum of its proper divisors (21832250).

43664494 is a wasteful number, since it uses less digits than its factorization.

43664494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21832249.

The product of its digits is 248832, while the sum is 40.

The square root of 43664494 is about 6607.9114703513. The cubic root of 43664494 is about 352.1352301950.

The spelling of 43664494 in words is "forty-three million, six hundred sixty-four thousand, four hundred ninety-four".