214857989 has 4 divisors (see below), whose sum is σ = 214926156. Its totient is φ = 214789824.

The previous prime is 214857983. The next prime is 214857991. The reversal of 214857989 is 989758412.

214857989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 184497889 + 30360100 = 13583^2 + 5510^2 .

It is a cyclic number.

It is not a de Polignac number, because 214857989 - 2¹² = 214853893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 214857989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (214857983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29114 + ... + 35739.

It is an arithmetic number, because the mean of its divisors is an integer number (53731539).

Almost surely, 2^214857989 is an apocalyptic number.

It is an amenable number.

214857989 is a deficient number, since it is larger than the sum of its proper divisors (68167).

214857989 is an equidigital number, since it uses as much as digits as its factorization.

214857989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68166.

The product of its digits is 1451520, while the sum is 53.

The square root of 214857989 is about 14658.0349638006. The cubic root of 214857989 is about 598.9407133610.

The spelling of 214857989 in words is "two hundred fourteen million, eight hundred fifty-seven thousand, nine hundred eighty-nine".