216951390 has 24 divisors (see below), whose sum is σ = 564073848. Its totient is φ = 57853680.

The previous prime is 216951373. The next prime is 216951409. The reversal of 216951390 is 93159612.

216951390 is a `hidden beast` number, since 216 + 9 + 51 + 390 = 666.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1205196 + ... + 1205375.

It is an arithmetic number, because the mean of its divisors is an integer number (23503077).

Almost surely, 2^216951390 is an apocalyptic number.

216951390 is an abundant number, since it is smaller than the sum of its proper divisors (347122458).

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

216951390 is a wasteful number, since it uses less digits than its factorization.

216951390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2410584 (or 2410581 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 216951390 is about 14729.2698393369. The cubic root of 216951390 is about 600.8796264653.

The spelling of 216951390 in words is "two hundred sixteen million, nine hundred fifty-one thousand, three hundred ninety".