1988393 has 6 divisors (see below), whose sum is σ = 2185722. Its totient is φ = 1807520.

The previous prime is 1988353. The next prime is 1988411. The reversal of 1988393 is 3938891.

It can be written as a sum of positive squares in only one way, i.e., 1982464 + 5929 = 1408^2 + 77^2 .

It is not a de Polignac number, because 1988393 - 2⁸ = 1988137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1988393.

It is not an unprimeable number, because it can be changed into a prime (1988323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8096 + ... + 8337.

It is an arithmetic number, because the mean of its divisors is an integer number (364287).

2^1988393 is an apocalyptic number.

It is an amenable number.

1988393 is a deficient number, since it is larger than the sum of its proper divisors (197329).

1988393 is a wasteful number, since it uses less digits than its factorization.

1988393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16455 (or 16444 counting only the distinct ones).

The product of its digits is 46656, while the sum is 41.

The square root of 1988393 is about 1410.1038968814. The cubic root of 1988393 is about 125.7479002373.

The spelling of 1988393 in words is "one million, nine hundred eighty-eight thousand, three hundred ninety-three".