43421579 has 2 divisors, whose sum is σ = 43421580. Its totient is φ = 43421578.

The previous prime is 43421557. The next prime is 43421597. The reversal of 43421579 is 97512434.

Together with next prime (43421597) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43421579 - 2²⁰ = 42373003 is a prime.

It is not a weakly prime, because it can be changed into another prime (43421549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21710789 + 21710790.

It is an arithmetic number, because the mean of its divisors is an integer number (21710790).

Almost surely, 2^43421579 is an apocalyptic number.

43421579 is a deficient number, since it is larger than the sum of its proper divisors (1).

43421579 is an equidigital number, since it uses as much as digits as its factorization.

43421579 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 35.

The square root of 43421579 is about 6589.5052166305. The cubic root of 43421579 is about 351.4810140916.

The spelling of 43421579 in words is "forty-three million, four hundred twenty-one thousand, five hundred seventy-nine".