2131864 has 16 divisors (see below), whose sum is σ = 4568400. Its totient is φ = 913632.

The previous prime is 2131859. The next prime is 2131867. The reversal of 2131864 is 4681312.

It is a super-2 number, since 2×2131864² = 9089688228992, which contains 22 as substring.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18979 + ... + 19090.

It is an arithmetic number, because the mean of its divisors is an integer number (285525).

2^2131864 is an apocalyptic number.

It is an amenable number.

2131864 is an abundant number, since it is smaller than the sum of its proper divisors (2436536).

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

2131864 is a wasteful number, since it uses less digits than its factorization.

2131864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38082 (or 38078 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 2131864 is about 1460.0904081597. The cubic root of 2131864 is about 128.7023564567.

The spelling of 2131864 in words is "two million, one hundred thirty-one thousand, eight hundred sixty-four".