2100404 has 6 divisors (see below), whose sum is σ = 3675714. Its totient is φ = 1050200.

The previous prime is 2100403. The next prime is 2100407. The reversal of 2100404 is 4040012.

It can be written as a sum of positive squares in only one way, i.e., 1567504 + 532900 = 1252^2 + 730^2 .

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100403) 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 as a sum of consecutive naturals, namely, 262547 + ... + 262554.

It is an arithmetic number, because the mean of its divisors is an integer number (612619).

2^2100404 is an apocalyptic number.

It is an amenable number.

2100404 is a deficient number, since it is larger than the sum of its proper divisors (1575310).

2100404 is a wasteful number, since it uses less digits than its factorization.

2100404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525105 (or 525103 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 2100404 is about 1449.2770611584. The cubic root of 2100404 is about 128.0661279402.

Adding to 2100404 its reverse (4040012), we get a palindrome (6140416).

The spelling of 2100404 in words is "two million, one hundred thousand, four hundred four".