216165388 has 12 divisors (see below), whose sum is σ = 379345680. Its totient is φ = 107780912.

The previous prime is 216165347. The next prime is 216165401. The reversal of 216165388 is 883561612.

It is a self number, because there is not a number n which added to its sum of digits gives 216165388.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73831 + ... + 76702.

It is an arithmetic number, because the mean of its divisors is an integer number (31612140).

Almost surely, 2^216165388 is an apocalyptic number.

It is an amenable number.

216165388 is a deficient number, since it is larger than the sum of its proper divisors (163180292).

216165388 is a wasteful number, since it uses less digits than its factorization.

216165388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150896 (or 150894 counting only the distinct ones).

The product of its digits is 69120, while the sum is 40.

The square root of 216165388 is about 14702.5639940794. The cubic root of 216165388 is about 600.1530979687.

The spelling of 216165388 in words is "two hundred sixteen million, one hundred sixty-five thousand, three hundred eighty-eight".