1331998 has 8 divisors (see below), whose sum is σ = 2003040. Its totient is φ = 664320.

The previous prime is 1331989. The next prime is 1332017. The reversal of 1331998 is 8991331.

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

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 763 + ... + 1801.

It is an arithmetic number, because the mean of its divisors is an integer number (250380).

2^1331998 is an apocalyptic number.

1331998 is a deficient number, since it is larger than the sum of its proper divisors (671042).

1331998 is a wasteful number, since it uses less digits than its factorization.

1331998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1682.

The product of its digits is 5832, while the sum is 34.

The square root of 1331998 is about 1154.1221772412. The cubic root of 1331998 is about 110.0274862443.

The spelling of 1331998 in words is "one million, three hundred thirty-one thousand, nine hundred ninety-eight".