216394379 has 4 divisors (see below), whose sum is σ = 217256760. Its totient is φ = 215532000.

The previous prime is 216394357. The next prime is 216394427. The reversal of 216394379 is 973493612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216394379 - 2¹² = 216390283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216394319) 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, 430814 + ... + 431315.

It is an arithmetic number, because the mean of its divisors is an integer number (54314190).

Almost surely, 2^216394379 is an apocalyptic number.

216394379 is a deficient number, since it is larger than the sum of its proper divisors (862381).

216394379 is an equidigital number, since it uses as much as digits as its factorization.

216394379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862380.

The product of its digits is 244944, while the sum is 44.

The square root of 216394379 is about 14710.3493840221. The cubic root of 216394379 is about 600.3649437225.

The spelling of 216394379 in words is "two hundred sixteen million, three hundred ninety-four thousand, three hundred seventy-nine".