216311442 has 8 divisors (see below), whose sum is σ = 432622896. Its totient is φ = 72103812.

The previous prime is 216311441. The next prime is 216311453. The reversal of 216311442 is 244113612.

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

216311442 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (216311441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18025948 + ... + 18025959.

It is an arithmetic number, because the mean of its divisors is an integer number (54077862).

Almost surely, 2^216311442 is an apocalyptic number.

216311442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216311442 is a wasteful number, since it uses less digits than its factorization.

216311442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36051912.

The product of its digits is 1152, while the sum is 24.

The square root of 216311442 is about 14707.5301121568. The cubic root of 216311442 is about 600.2882337356.

The spelling of 216311442 in words is "two hundred sixteen million, three hundred eleven thousand, four hundred forty-two".