216929986 has 16 divisors (see below), whose sum is σ = 400486464. Its totient is φ = 85818384.

The previous prime is 216929963. The next prime is 216929989. The reversal of 216929986 is 689929612.

216929986 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (216929989) 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, 595780 + ... + 596143.

It is an arithmetic number, because the mean of its divisors is an integer number (25030404).

Almost surely, 2^216929986 is an apocalyptic number.

216929986 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

216929986 is a deficient number, since it is larger than the sum of its proper divisors (183556478).

216929986 is a wasteful number, since it uses less digits than its factorization.

216929986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1191945.

The product of its digits is 839808, while the sum is 52.

The square root of 216929986 is about 14728.5432409319. The cubic root of 216929986 is about 600.8598652790.

The spelling of 216929986 in words is "two hundred sixteen million, nine hundred twenty-nine thousand, nine hundred eighty-six".