216423439 has 2 divisors, whose sum is σ = 216423440. Its totient is φ = 216423438.

The previous prime is 216423409. The next prime is 216423451. The reversal of 216423439 is 934324612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216423439 - 2¹¹ = 216421391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216423409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108211719 + 108211720.

It is an arithmetic number, because the mean of its divisors is an integer number (108211720).

Almost surely, 2^216423439 is an apocalyptic number.

216423439 is a deficient number, since it is larger than the sum of its proper divisors (1).

216423439 is an equidigital number, since it uses as much as digits as its factorization.

216423439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 34.

The square root of 216423439 is about 14711.3370908290. The cubic root of 216423439 is about 600.3918172246.

The spelling of 216423439 in words is "two hundred sixteen million, four hundred twenty-three thousand, four hundred thirty-nine".