2131900 has 18 divisors (see below), whose sum is σ = 4626440. Its totient is φ = 852720.

The previous prime is 2131867. The next prime is 2131907. The reversal of 2131900 is 91312.

It is a super-2 number, since 2×2131900² = 9089995220000, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131907) 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, 10560 + ... + 10759.

2^2131900 is an apocalyptic number.

2131900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2131900 is an abundant number, since it is smaller than the sum of its proper divisors (2494540).

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

2131900 is a wasteful number, since it uses less digits than its factorization.

2131900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21333 (or 21326 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 2131900 is about 1460.1027361114. The cubic root of 2131900 is about 128.7030809024.

The spelling of 2131900 in words is "two million, one hundred thirty-one thousand, nine hundred".