1988217 has 48 divisors (see below), whose sum is σ = 3793920. Its totient is φ = 972000.

The previous prime is 1988197. The next prime is 1988219. The reversal of 1988217 is 7128891.

It is not a de Polignac number, because 1988217 - 2⁷ = 1988089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1988219) 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 in 47 ways as a sum of consecutive naturals, for example, 13092 + ... + 13242.

It is an arithmetic number, because the mean of its divisors is an integer number (79040).

2^1988217 is an apocalyptic number.

It is an amenable number.

1988217 is a deficient number, since it is larger than the sum of its proper divisors (1805703).

1988217 is a wasteful number, since it uses less digits than its factorization.

1988217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194 (or 191 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 1988217 is about 1410.0414887513. The cubic root of 1988217 is about 125.7441899909.

The spelling of 1988217 in words is "one million, nine hundred eighty-eight thousand, two hundred seventeen".