213686466 has 16 divisors (see below), whose sum is σ = 488426304. Its totient is φ = 61053264.

The previous prime is 213686453. The next prime is 213686497. The reversal of 213686466 is 664686312.

213686466 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 5087773 = 213686466 / (2 + 1 + 3 + 6 + 8 + 6 + 4 + 6 + 6).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2543845 + ... + 2543928.

It is an arithmetic number, because the mean of its divisors is an integer number (30526644).

Almost surely, 2^213686466 is an apocalyptic number.

213686466 is an abundant number, since it is smaller than the sum of its proper divisors (274739838).

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

213686466 is a wasteful number, since it uses less digits than its factorization.

213686466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5087785.

The product of its digits is 248832, while the sum is 42.

The square root of 213686466 is about 14618.0185387760. The cubic root of 213686466 is about 597.8501449614.

The spelling of 213686466 in words is "two hundred thirteen million, six hundred eighty-six thousand, four hundred sixty-six".