43294721 has 2 divisors, whose sum is σ = 43294722. Its totient is φ = 43294720.

The previous prime is 43294697. The next prime is 43294723. The reversal of 43294721 is 12749234.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43033600 + 261121 = 6560^2 + 511^2 .

It is a cyclic number.

It is not a de Polignac number, because 43294721 - 2¹⁰ = 43293697 is a prime.

Together with 43294723, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (43294723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21647360 + 21647361.

It is an arithmetic number, because the mean of its divisors is an integer number (21647361).

It is a Proth number, since it is equal to 5285 ⋅ 2¹³ + 1 and 5285 < 2¹³.

Almost surely, 2^43294721 is an apocalyptic number.

It is an amenable number.

43294721 is a deficient number, since it is larger than the sum of its proper divisors (1).

43294721 is an equidigital number, since it uses as much as digits as its factorization.

43294721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 32.

The square root of 43294721 is about 6579.8724151765. The cubic root of 43294721 is about 351.1383912743.

The spelling of 43294721 in words is "forty-three million, two hundred ninety-four thousand, seven hundred twenty-one".