43998165 has 24 divisors (see below), whose sum is σ = 76598808. Its totient is φ = 23362560.

The previous prime is 43998161. The next prime is 43998173. The reversal of 43998165 is 56189934.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8678916 + 35319249 = 2946^2 + 5943^2 .

It is not a de Polignac number, because 43998165 - 2² = 43998161 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 43998165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43998161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8817 + ... + 12873.

It is an arithmetic number, because the mean of its divisors is an integer number (3191617).

Almost surely, 2^43998165 is an apocalyptic number.

43998165 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

43998165 is a deficient number, since it is larger than the sum of its proper divisors (32600643).

43998165 is a wasteful number, since it uses less digits than its factorization.

43998165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4309 (or 4306 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 43998165 is about 6633.1112609393. Note that the first 3 decimals coincide. The cubic root of 43998165 is about 353.0299257453.

The spelling of 43998165 in words is "forty-three million, nine hundred ninety-eight thousand, one hundred sixty-five".