216270399 has 4 divisors (see below), whose sum is σ = 288360536. Its totient is φ = 144180264.

The previous prime is 216270377. The next prime is 216270401. The reversal of 216270399 is 993072612.

216270399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 216270399 - 2⁹ = 216269887 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 (216270319) 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, 36045064 + ... + 36045069.

It is an arithmetic number, because the mean of its divisors is an integer number (72090134).

Almost surely, 2^216270399 is an apocalyptic number.

216270399 is a deficient number, since it is larger than the sum of its proper divisors (72090137).

216270399 is an equidigital number, since it uses as much as digits as its factorization.

216270399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72090136.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 216270399 is about 14706.1347403048. The cubic root of 216270399 is about 600.2502650423.

The spelling of 216270399 in words is "two hundred sixteen million, two hundred seventy thousand, three hundred ninety-nine".