2116404 has 18 divisors (see below), whose sum is σ = 5349890. Its totient is φ = 705456.

The previous prime is 2116403. The next prime is 2116409. The reversal of 2116404 is 4046112.

2116404 is a `hidden beast` number, since 21 + 1 + 640 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2108304 + 8100 = 1452^2 + 90^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2116403) 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, 29359 + ... + 29430.

2^2116404 is an apocalyptic number.

It is an amenable number.

2116404 is an abundant number, since it is smaller than the sum of its proper divisors (3233486).

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

2116404 is a wasteful number, since it uses less digits than its factorization.

2116404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58799 (or 58794 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 2116404 is about 1454.7865822862. The cubic root of 2116404 is about 128.3904904594.

The spelling of 2116404 in words is "two million, one hundred sixteen thousand, four hundred four".