216424940 has 24 divisors (see below), whose sum is σ = 474253920. Its totient is φ = 82805888.

The previous prime is 216424931. The next prime is 216424973. The reversal of 216424940 is 49424612.

216424940 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 216424897 and 216424906.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234785 + ... + 235704.

It is an arithmetic number, because the mean of its divisors is an integer number (19760580).

Almost surely, 2^216424940 is an apocalyptic number.

216424940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216424940 is an abundant number, since it is smaller than the sum of its proper divisors (257828980).

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

216424940 is a wasteful number, since it uses less digits than its factorization.

216424940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470521 (or 470519 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 216424940 is about 14711.3881058179. The cubic root of 216424940 is about 600.3932052228.

The spelling of 216424940 in words is "two hundred sixteen million, four hundred twenty-four thousand, nine hundred forty".