213900687 has 48 divisors (see below), whose sum is σ = 414855168. Its totient is φ = 102565440.

The previous prime is 213900683. The next prime is 213900691. The reversal of 213900687 is 786009312.

It is an interprime number because it is at equal distance from previous prime (213900683) and next prime (213900691).

It is not a de Polignac number, because 213900687 - 2² = 213900683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213900683) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2863 + ... + 20880.

It is an arithmetic number, because the mean of its divisors is an integer number (8642816).

Almost surely, 2^213900687 is an apocalyptic number.

213900687 is a deficient number, since it is larger than the sum of its proper divisors (200954481).

213900687 is a wasteful number, since it uses less digits than its factorization.

213900687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23780 (or 23777 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 213900687 is about 14625.3439959544. The cubic root of 213900687 is about 598.0498601245.

Adding to 213900687 its reverse (786009312), we get a palindrome (999909999).

The spelling of 213900687 in words is "two hundred thirteen million, nine hundred thousand, six hundred eighty-seven".