218902987 has 4 divisors (see below), whose sum is σ = 219020760. Its totient is φ = 218785216.

The previous prime is 218902967. The next prime is 218903023. The reversal of 218902987 is 789209812.

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

It is a cyclic number.

It is not a de Polignac number, because 218902987 - 2²³ = 210514379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218902967) 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 3 ways as a sum of consecutive naturals, for example, 56053 + ... + 59830.

It is an arithmetic number, because the mean of its divisors is an integer number (54755190).

Almost surely, 2^218902987 is an apocalyptic number.

218902987 is a deficient number, since it is larger than the sum of its proper divisors (117773).

218902987 is a wasteful number, since it uses less digits than its factorization.

218902987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117772.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 218902987 is about 14795.3704583562. The cubic root of 218902987 is about 602.6759982384.

The spelling of 218902987 in words is "two hundred eighteen million, nine hundred two thousand, nine hundred eighty-seven".