213945687 has 6 divisors (see below), whose sum is σ = 309032672. Its totient is φ = 142630452.

The previous prime is 213945679. The next prime is 213945689. The reversal of 213945687 is 786549312.

It is not a de Polignac number, because 213945687 - 2³ = 213945679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213945689) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 11885863 + ... + 11885880.

Almost surely, 2^213945687 is an apocalyptic number.

213945687 is a deficient number, since it is larger than the sum of its proper divisors (95086985).

213945687 is a wasteful number, since it uses less digits than its factorization.

213945687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23771749 (or 23771746 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 213945687 is about 14626.8823404032. The cubic root of 213945687 is about 598.0917960296.

The spelling of 213945687 in words is "two hundred thirteen million, nine hundred forty-five thousand, six hundred eighty-seven".