1988331 has 8 divisors (see below), whose sum is σ = 2790720. Its totient is φ = 1255752.

The previous prime is 1988323. The next prime is 1988339. The reversal of 1988331 is 1338891.

It is an interprime number because it is at equal distance from previous prime (1988323) and next prime (1988339).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1988331 - 2³ = 1988323 is a prime.

It is a super-2 number, since 2×1988331² = 7906920331122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1988292 and 1988301.

It is not an unprimeable number, because it can be changed into a prime (1988339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17385 + ... + 17498.

It is an arithmetic number, because the mean of its divisors is an integer number (348840).

2^1988331 is an apocalyptic number.

1988331 is a deficient number, since it is larger than the sum of its proper divisors (802389).

1988331 is a wasteful number, since it uses less digits than its factorization.

1988331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34905.

The product of its digits is 5184, while the sum is 33.

The square root of 1988331 is about 1410.0819125143. The cubic root of 1988331 is about 125.7465932436.

The spelling of 1988331 in words is "one million, nine hundred eighty-eight thousand, three hundred thirty-one".