1900404 has 36 divisors (see below), whose sum is σ = 5241600. Its totient is φ = 575760.

The previous prime is 1900397. The next prime is 1900429. The reversal of 1900404 is 4040091.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1900404² = 7223070726432, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2004 + ... + 2795.

It is an arithmetic number, because the mean of its divisors is an integer number (145600).

2^1900404 is an apocalyptic number.

It is an amenable number.

1900404 is an abundant number, since it is smaller than the sum of its proper divisors (3341196).

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

1900404 is a wasteful number, since it uses less digits than its factorization.

1900404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4820 (or 4815 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1900404 is about 1378.5514136223. The cubic root of 1900404 is about 123.8650109230.

Adding to 1900404 its reverse (4040091), we get a palindrome (5940495).

It can be divided in two parts, 1900 and 404, that added together give a square (2304 = 48²).

The spelling of 1900404 in words is "one million, nine hundred thousand, four hundred four".