1988859 has 4 divisors (see below), whose sum is σ = 2651816. Its totient is φ = 1325904.

The previous prime is 1988851. The next prime is 1988887. The reversal of 1988859 is 9588891.

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

It is not a de Polignac number, because 1988859 - 2³ = 1988851 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1988851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331474 + ... + 331479.

It is an arithmetic number, because the mean of its divisors is an integer number (662954).

2^1988859 is an apocalyptic number.

1988859 is a deficient number, since it is larger than the sum of its proper divisors (662957).

1988859 is an equidigital number, since it uses as much as digits as its factorization.

1988859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662956.

The product of its digits is 207360, while the sum is 48.

The square root of 1988859 is about 1410.2691232527. The cubic root of 1988859 is about 125.7577229005.

The spelling of 1988859 in words is "one million, nine hundred eighty-eight thousand, eight hundred fifty-nine".