216439373 has 2 divisors, whose sum is σ = 216439374. Its totient is φ = 216439372.

The previous prime is 216439357. The next prime is 216439397. The reversal of 216439373 is 373934612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189420169 + 27019204 = 13763^2 + 5198^2 .

It is a cyclic number.

It is not a de Polignac number, because 216439373 - 2⁴ = 216439357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216439343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108219686 + 108219687.

It is an arithmetic number, because the mean of its divisors is an integer number (108219687).

Almost surely, 2^216439373 is an apocalyptic number.

It is an amenable number.

216439373 is a deficient number, since it is larger than the sum of its proper divisors (1).

216439373 is an equidigital number, since it uses as much as digits as its factorization.

216439373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 38.

The square root of 216439373 is about 14711.8786359866. The cubic root of 216439373 is about 600.4065513163.

The spelling of 216439373 in words is "two hundred sixteen million, four hundred thirty-nine thousand, three hundred seventy-three".