987821355 has 32 divisors (see below), whose sum is σ = 1635913728. Its totient is φ = 508464000.

The previous prime is 987821353. The next prime is 987821357. The reversal of 987821355 is 553128789.

It is an interprime number because it is at equal distance from previous prime (987821353) and next prime (987821357).

It is not a de Polignac number, because 987821355 - 2¹ = 987821353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (987821353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 181930 + ... + 187280.

It is an arithmetic number, because the mean of its divisors is an integer number (51122304).

Almost surely, 2^987821355 is an apocalyptic number.

987821355 is a deficient number, since it is larger than the sum of its proper divisors (648092373).

987821355 is a wasteful number, since it uses less digits than its factorization.

987821355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5787.

The product of its digits is 604800, while the sum is 48.

The square root of 987821355 is about 31429.6254352482. The cubic root of 987821355 is about 995.9238593187.

The spelling of 987821355 in words is "nine hundred eighty-seven million, eight hundred twenty-one thousand, three hundred fifty-five".