216026406 has 16 divisors (see below), whose sum is σ = 480058800. Its totient is φ = 72008784.

The previous prime is 216026401. The next prime is 216026431. The reversal of 216026406 is 604620612.

It is a happy number.

216026406 is a `hidden beast` number, since 2 + 16 + 0 + 2 + 640 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 216026406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216026401) 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, 2000191 + ... + 2000298.

It is an arithmetic number, because the mean of its divisors is an integer number (30003675).

Almost surely, 2^216026406 is an apocalyptic number.

216026406 is an abundant number, since it is smaller than the sum of its proper divisors (264032394).

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

216026406 is a wasteful number, since it uses less digits than its factorization.

216026406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4000500 (or 4000494 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 216026406 is about 14697.8367796081. The cubic root of 216026406 is about 600.0244490037.

The spelling of 216026406 in words is "two hundred sixteen million, twenty-six thousand, four hundred six".