43995973 has 6 divisors (see below), whose sum is σ = 51179046. Its totient is φ = 37710792.

The previous prime is 43995971. The next prime is 43995977. The reversal of 43995973 is 37959934.

It can be written as a sum of positive squares in only one way, i.e., 42016324 + 1979649 = 6482^2 + 1407^2 .

It is not a de Polignac number, because 43995973 - 2¹ = 43995971 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 897877 = 43995973 / (4 + 3 + 9 + 9 + 5 + 9 + 7 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43995971) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 448890 + ... + 448987.

It is an arithmetic number, because the mean of its divisors is an integer number (8529841).

Almost surely, 2^43995973 is an apocalyptic number.

It is an amenable number.

43995973 is a deficient number, since it is larger than the sum of its proper divisors (7183073).

43995973 is an equidigital number, since it uses as much as digits as its factorization.

43995973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897891 (or 897884 counting only the distinct ones).

The product of its digits is 918540, while the sum is 49.

The square root of 43995973 is about 6632.9460272190. The cubic root of 43995973 is about 353.0240629671.

The spelling of 43995973 in words is "forty-three million, nine hundred ninety-five thousand, nine hundred seventy-three".