216376399 has 4 divisors (see below), whose sum is σ = 216407880. Its totient is φ = 216344920.

The previous prime is 216376397. The next prime is 216376403. The reversal of 216376399 is 993673612.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 216376399 - 2¹ = 216376397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216376397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532 + ... + 20809.

It is an arithmetic number, because the mean of its divisors is an integer number (54101970).

Almost surely, 2^216376399 is an apocalyptic number.

216376399 is a deficient number, since it is larger than the sum of its proper divisors (31481).

216376399 is a wasteful number, since it uses less digits than its factorization.

216376399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31480.

The product of its digits is 367416, while the sum is 46.

The square root of 216376399 is about 14709.7382369640. The cubic root of 216376399 is about 600.3483153475.

The spelling of 216376399 in words is "two hundred sixteen million, three hundred seventy-six thousand, three hundred ninety-nine".