2128404 has 24 divisors (see below), whose sum is σ = 4997440. Its totient is φ = 705024.

The previous prime is 2128403. The next prime is 2128409. The reversal of 2128404 is 4048212.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2128403) 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, 1857 + ... + 2775.

2^2128404 is an apocalyptic number.

It is an amenable number.

2128404 is an abundant number, since it is smaller than the sum of its proper divisors (2869036).

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

2128404 is a wasteful number, since it uses less digits than its factorization.

2128404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119 (or 1117 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 2128404 is about 1458.9050688787. The cubic root of 2128404 is about 128.6326910868.

The spelling of 2128404 in words is "two million, one hundred twenty-eight thousand, four hundred four".