216000138 has 32 divisors (see below), whose sum is σ = 440689536. Its totient is φ = 70564608.

The previous prime is 216000131. The next prime is 216000139. The reversal of 216000138 is 831000612.

It is not an unprimeable number, because it can be changed into a prime (216000131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71670 + ... + 74622.

It is an arithmetic number, because the mean of its divisors is an integer number (13771548).

Almost surely, 2^216000138 is an apocalyptic number.

216000138 is an abundant number, since it is smaller than the sum of its proper divisors (224689398).

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

216000138 is a wasteful number, since it uses less digits than its factorization.

216000138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3198.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 216000138 is about 14696.9431515537. The cubic root of 216000138 is about 600.0001277778. Note that the first 3 decimals are identical.

The spelling of 216000138 in words is "two hundred sixteen million, one hundred thirty-eight", and thus it is an aban number.