213456987 has 6 divisors (see below), whose sum is σ = 308326772. Its totient is φ = 142304652.

The previous prime is 213456983. The next prime is 213457003. The reversal of 213456987 is 789654312.

213456987 is a `hidden beast` number, since 2 + 1 + 3 + 4 + 569 + 87 = 666.

213456987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 213456987 - 2² = 213456983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213456983) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11858713 + ... + 11858730.

Almost surely, 2^213456987 is an apocalyptic number.

213456987 is a deficient number, since it is larger than the sum of its proper divisors (94869785).

213456987 is a wasteful number, since it uses less digits than its factorization.

213456987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23717449 (or 23717446 counting only the distinct ones).

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

The square root of 213456987 is about 14610.1672475027. The cubic root of 213456987 is about 597.6360568530.

The spelling of 213456987 in words is "two hundred thirteen million, four hundred fifty-six thousand, nine hundred eighty-seven".