43219973 has 4 divisors (see below), whose sum is σ = 43240428. Its totient is φ = 43199520.

The previous prime is 43219937. The next prime is 43219987. The reversal of 43219973 is 37991234.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37991234 = 2 ⋅18995617.

It can be written as a sum of positive squares in 2 ways, for example, as 15108769 + 28111204 = 3887^2 + 5302^2 .

It is a cyclic number.

It is not a de Polignac number, because 43219973 - 2⁶ = 43219909 is a prime.

It is a super-2 number, since 2×43219973² = 3735932132241458, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43219573) 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, 6638 + ... + 11423.

It is an arithmetic number, because the mean of its divisors is an integer number (10810107).

Almost surely, 2^43219973 is an apocalyptic number.

It is an amenable number.

43219973 is a deficient number, since it is larger than the sum of its proper divisors (20455).

43219973 is a wasteful number, since it uses less digits than its factorization.

43219973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20454.

The product of its digits is 40824, while the sum is 38.

The square root of 43219973 is about 6574.1899120728. The cubic root of 43219973 is about 350.9361956302.

The spelling of 43219973 in words is "forty-three million, two hundred nineteen thousand, nine hundred seventy-three".