216354406 has 24 divisors (see below), whose sum is σ = 345298680. Its totient is φ = 101388672.

The previous prime is 216354403. The next prime is 216354419. The reversal of 216354406 is 604453612.

It is a super-2 number, since 2×216354406² = 93618457991225672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216354401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 612726 + ... + 613078.

It is an arithmetic number, because the mean of its divisors is an integer number (14387445).

Almost surely, 2^216354406 is an apocalyptic number.

216354406 is a deficient number, since it is larger than the sum of its proper divisors (128944274).

216354406 is a wasteful number, since it uses less digits than its factorization.

216354406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628 (or 501 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 216354406 is about 14708.9906519788. The cubic root of 216354406 is about 600.3279743924.

The spelling of 216354406 in words is "two hundred sixteen million, three hundred fifty-four thousand, four hundred six".