213717930 has 32 divisors (see below), whose sum is σ = 523839744. Its totient is φ = 55778496.

The previous prime is 213717929. The next prime is 213717943. The reversal of 213717930 is 39717312.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 213717891 and 213717900.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74377 + ... + 77196.

It is an arithmetic number, because the mean of its divisors is an integer number (16369992).

Almost surely, 2^213717930 is an apocalyptic number.

213717930 is an abundant number, since it is smaller than the sum of its proper divisors (310121814).

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

213717930 is a wasteful number, since it uses less digits than its factorization.

213717930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151630.

The product of its (nonzero) digits is 7938, while the sum is 33.

The square root of 213717930 is about 14619.0947052135. The cubic root of 213717930 is about 597.8794867569.

The spelling of 213717930 in words is "two hundred thirteen million, seven hundred seventeen thousand, nine hundred thirty".