210404404 has 48 divisors (see below), whose sum is σ = 444366720. Its totient is φ = 85155840.

The previous prime is 210404399. The next prime is 210404407. The reversal of 210404404 is 404404012.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210404407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 327924 + ... + 328564.

It is an arithmetic number, because the mean of its divisors is an integer number (9257640).

Almost surely, 2^210404404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 210404404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222183360).

210404404 is an abundant number, since it is smaller than the sum of its proper divisors (233962316).

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

210404404 is a wasteful number, since it uses less digits than its factorization.

210404404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1288 (or 1286 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 210404404 is about 14505.3232987066. The cubic root of 210404404 is about 594.7734975733.

Adding to 210404404 its reverse (404404012), we get a palindrome (614808416).

The spelling of 210404404 in words is "two hundred ten million, four hundred four thousand, four hundred four".