216709379 has 8 divisors (see below), whose sum is σ = 222045120. Its totient is φ = 211387176.

The previous prime is 216709357. The next prime is 216709399. The reversal of 216709379 is 973907612.

It is a happy number.

216709379 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216709379 - 2⁸ = 216709123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216709399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34004 + ... + 39870.

It is an arithmetic number, because the mean of its divisors is an integer number (27755640).

Almost surely, 2^216709379 is an apocalyptic number.

216709379 is a deficient number, since it is larger than the sum of its proper divisors (5335741).

216709379 is an equidigital number, since it uses as much as digits as its factorization.

216709379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6769.

The product of its (nonzero) digits is 142884, while the sum is 44.

The square root of 216709379 is about 14721.0522382063. The cubic root of 216709379 is about 600.6561146685.

The spelling of 216709379 in words is "two hundred sixteen million, seven hundred nine thousand, three hundred seventy-nine".