43721273 has 2 divisors, whose sum is σ = 43721274. Its totient is φ = 43721272.

The previous prime is 43721269. The next prime is 43721281. The reversal of 43721273 is 37212734.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24078649 + 19642624 = 4907^2 + 4432^2 .

It is a cyclic number.

It is not a de Polignac number, because 43721273 - 2² = 43721269 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (43724273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21860636 + 21860637.

It is an arithmetic number, because the mean of its divisors is an integer number (21860637).

Almost surely, 2^43721273 is an apocalyptic number.

It is an amenable number.

43721273 is a deficient number, since it is larger than the sum of its proper divisors (1).

43721273 is an equidigital number, since it uses as much as digits as its factorization.

43721273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 29.

The square root of 43721273 is about 6612.2063639908. The cubic root of 43721273 is about 352.2877967644.

The spelling of 43721273 in words is "forty-three million, seven hundred twenty-one thousand, two hundred seventy-three".