1988851 has 2 divisors, whose sum is σ = 1988852. Its totient is φ = 1988850.

The previous prime is 1988843. The next prime is 1988887. The reversal of 1988851 is 1588891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1988851 - 2³ = 1988843 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1988801) 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 as a sum of consecutive naturals, namely, 994425 + 994426.

It is an arithmetic number, because the mean of its divisors is an integer number (994426).

2^1988851 is an apocalyptic number.

1988851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1988851 is an equidigital number, since it uses as much as digits as its factorization.

1988851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 40.

The square root of 1988851 is about 1410.2662869118. The cubic root of 1988851 is about 125.7575542840.

Adding to 1988851 its sum of digits (40), we get a palindrome (1988891).

The spelling of 1988851 in words is "one million, nine hundred eighty-eight thousand, eight hundred fifty-one".