1988917 has 4 divisors (see below), whose sum is σ = 2273056. Its totient is φ = 1704780.

The previous prime is 1988897. The next prime is 1988933. The reversal of 1988917 is 7198891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1988917 - 2¹¹ = 1986869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1982917) 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, 142059 + ... + 142072.

It is an arithmetic number, because the mean of its divisors is an integer number (568264).

2^1988917 is an apocalyptic number.

It is an amenable number.

1988917 is a deficient number, since it is larger than the sum of its proper divisors (284139).

1988917 is an equidigital number, since it uses as much as digits as its factorization.

1988917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284138.

The product of its digits is 36288, while the sum is 43.

The square root of 1988917 is about 1410.2896865538. The cubic root of 1988917 is about 125.7589453563.

The spelling of 1988917 in words is "one million, nine hundred eighty-eight thousand, nine hundred seventeen".