1988089 has 2 divisors, whose sum is σ = 1988090. Its totient is φ = 1988088.

The previous prime is 1988087. The next prime is 1988101. The reversal of 1988089 is 9808891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1982464 + 5625 = 1408^2 + 75^2 .

It is an emirp because it is prime and its reverse (9808891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1988089 - 2¹ = 1988087 is a prime.

Together with 1988087, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1988087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994044 + 994045.

It is an arithmetic number, because the mean of its divisors is an integer number (994045).

2^1988089 is an apocalyptic number.

It is an amenable number.

1988089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1988089 is an equidigital number, since it uses as much as digits as its factorization.

1988089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 43.

The square root of 1988089 is about 1409.9960992854. The cubic root of 1988089 is about 125.7414914924.

The spelling of 1988089 in words is "one million, nine hundred eighty-eight thousand, eighty-nine".