43427999 has 2 divisors, whose sum is σ = 43428000. Its totient is φ = 43427998.

The previous prime is 43427981. The next prime is 43428001. The reversal of 43427999 is 99972434.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43427999 - 2⁸ = 43427743 is a prime.

Together with 43428001, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43427099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21713999 + 21714000.

It is an arithmetic number, because the mean of its divisors is an integer number (21714000).

Almost surely, 2^43427999 is an apocalyptic number.

43427999 is a deficient number, since it is larger than the sum of its proper divisors (1).

43427999 is an equidigital number, since it uses as much as digits as its factorization.

43427999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 47.

The square root of 43427999 is about 6589.9923368696. The cubic root of 43427999 is about 351.4983357165.

The spelling of 43427999 in words is "forty-three million, four hundred twenty-seven thousand, nine hundred ninety-nine".