43478621 has 2 divisors, whose sum is σ = 43478622. Its totient is φ = 43478620.

The previous prime is 43478599. The next prime is 43478629. The reversal of 43478621 is 12687434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34987225 + 8491396 = 5915^2 + 2914^2 .

It is a cyclic number.

It is not a de Polignac number, because 43478621 - 2⁶ = 43478557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43478629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21739310 + 21739311.

It is an arithmetic number, because the mean of its divisors is an integer number (21739311).

Almost surely, 2^43478621 is an apocalyptic number.

It is an amenable number.

43478621 is a deficient number, since it is larger than the sum of its proper divisors (1).

43478621 is an equidigital number, since it uses as much as digits as its factorization.

43478621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 35.

The square root of 43478621 is about 6593.8320421436. The cubic root of 43478621 is about 351.6348577754.

The spelling of 43478621 in words is "forty-three million, four hundred seventy-eight thousand, six hundred twenty-one".