210873987 has 6 divisors (see below), whose sum is σ = 304595772. Its totient is φ = 140582652.

The previous prime is 210873983. The next prime is 210874003. The reversal of 210873987 is 789378012.

It is not a de Polignac number, because 210873987 - 2² = 210873983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (210873983) 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, 11715213 + ... + 11715230.

It is an arithmetic number, because the mean of its divisors is an integer number (50765962).

Almost surely, 2^210873987 is an apocalyptic number.

210873987 is a deficient number, since it is larger than the sum of its proper divisors (93721785).

210873987 is a wasteful number, since it uses less digits than its factorization.

210873987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23430449 (or 23430446 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 210873987 is about 14521.5008521847. The cubic root of 210873987 is about 595.2156429481.

The spelling of 210873987 in words is "two hundred ten million, eight hundred seventy-three thousand, nine hundred eighty-seven".