43936397 has 4 divisors (see below), whose sum is σ = 43949916. Its totient is φ = 43922880.

The previous prime is 43936391. The next prime is 43936423. The reversal of 43936397 is 79363934.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 19838116 + 24098281 = 4454^2 + 4909^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43936397 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 (43936391) 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, 1397 + ... + 9477.

It is an arithmetic number, because the mean of its divisors is an integer number (10987479).

Almost surely, 2^43936397 is an apocalyptic number.

It is an amenable number.

43936397 is a deficient number, since it is larger than the sum of its proper divisors (13519).

43936397 is an equidigital number, since it uses as much as digits as its factorization.

43936397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13518.

The product of its digits is 367416, while the sum is 44.

The square root of 43936397 is about 6628.4535903935. The cubic root of 43936397 is about 352.8646448773.

The spelling of 43936397 in words is "forty-three million, nine hundred thirty-six thousand, three hundred ninety-seven".