1987868355 has 32 divisors (see below), whose sum is σ = 3475699200. Its totient is φ = 962158080.

The previous prime is 1987868353. The next prime is 1987868381. The reversal of 1987868355 is 5538687891.

It is not a de Polignac number, because 1987868355 - 2¹ = 1987868353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1987868353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88779 + ... + 108891.

It is an arithmetic number, because the mean of its divisors is an integer number (108615600).

Almost surely, 2^1987868355 is an apocalyptic number.

1987868355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1987868355 is a deficient number, since it is larger than the sum of its proper divisors (1487830845).

1987868355 is a wasteful number, since it uses less digits than its factorization.

1987868355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20731.

The product of its digits is 14515200, while the sum is 60.

The square root of 1987868355 is about 44585.5173234538. The cubic root of 1987868355 is about 1257.3683957833.

The spelling of 1987868355 in words is "one billion, nine hundred eighty-seven million, eight hundred sixty-eight thousand, three hundred fifty-five".