214809685 has 8 divisors (see below), whose sum is σ = 258416856. Its totient is φ = 171417600.

The previous prime is 214809643. The next prime is 214809691. The reversal of 214809685 is 586908412.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 123454321 + 91355364 = 11111^2 + 9558^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 214809685 - 2⁹ = 214809173 is a prime.

It is a super-2 number, since 2×214809685² = 92286401539598450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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, 51564 + ... + 55573.

It is an arithmetic number, because the mean of its divisors is an integer number (32302107).

Almost surely, 2^214809685 is an apocalyptic number.

It is an amenable number.

214809685 is a deficient number, since it is larger than the sum of its proper divisors (43607171).

214809685 is a wasteful number, since it uses less digits than its factorization.

214809685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107543.

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 214809685 is about 14656.3871741981. The cubic root of 214809685 is about 598.8958257266.

The spelling of 214809685 in words is "two hundred fourteen million, eight hundred nine thousand, six hundred eighty-five".