43597997 has 4 divisors (see below), whose sum is σ = 45004416. Its totient is φ = 42191580.

The previous prime is 43597987. The next prime is 43598011. The reversal of 43597997 is 79979534.

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 a cyclic number.

It is not a de Polignac number, because 43597997 - 2²⁰ = 42549421 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 (43597927) 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, 703163 + ... + 703224.

It is an arithmetic number, because the mean of its divisors is an integer number (11251104).

Almost surely, 2^43597997 is an apocalyptic number.

It is an amenable number.

43597997 is a deficient number, since it is larger than the sum of its proper divisors (1406419).

43597997 is a wasteful number, since it uses less digits than its factorization.

43597997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406418.

The product of its digits is 2143260, while the sum is 53.

The square root of 43597997 is about 6602.8779331440. The cubic root of 43597997 is about 351.9563828746.

The spelling of 43597997 in words is "forty-three million, five hundred ninety-seven thousand, nine hundred ninety-seven".