2131998 has 16 divisors (see below), whose sum is σ = 4651776. Its totient is φ = 646040.

The previous prime is 2131991. The next prime is 2132003. The reversal of 2131998 is 8991312.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16086 + ... + 16217.

It is an arithmetic number, because the mean of its divisors is an integer number (290736).

2^2131998 is an apocalyptic number.

2131998 is an abundant number, since it is smaller than the sum of its proper divisors (2519778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2131998 is a wasteful number, since it uses less digits than its factorization.

2131998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32319.

The product of its digits is 3888, while the sum is 33.

The square root of 2131998 is about 1460.1362950081. The cubic root of 2131998 is about 128.7050529631.

It can be divided in two parts, 213 and 1998, that added together give a triangular number (2211 = T₆₆).

The spelling of 2131998 in words is "two million, one hundred thirty-one thousand, nine hundred ninety-eight".