43128397 has 4 divisors (see below), whose sum is σ = 46445980. Its totient is φ = 39810816.

The previous prime is 43128389. The next prime is 43128451. The reversal of 43128397 is 79382134.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25664356 + 17464041 = 5066^2 + 4179^2 .

It is a cyclic number.

It is not a de Polignac number, because 43128397 - 2³ = 43128389 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 (43128367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1658772 + ... + 1658797.

It is an arithmetic number, because the mean of its divisors is an integer number (11611495).

Almost surely, 2^43128397 is an apocalyptic number.

It is an amenable number.

43128397 is a deficient number, since it is larger than the sum of its proper divisors (3317583).

43128397 is a wasteful number, since it uses less digits than its factorization.

43128397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3317582.

The product of its digits is 36288, while the sum is 37.

The square root of 43128397 is about 6567.2214063484. The cubic root of 43128397 is about 350.6881617122.

The spelling of 43128397 in words is "forty-three million, one hundred twenty-eight thousand, three hundred ninety-seven".