19804212 has 18 divisors (see below), whose sum is σ = 50060738. Its totient is φ = 6601392.

The previous prime is 19804193. The next prime is 19804223. The reversal of 19804212 is 21240891.

It can be written as a sum of positive squares in only one way, i.e., 18714276 + 1089936 = 4326^2 + 1044^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 275023 + ... + 275094.

Almost surely, 2^19804212 is an apocalyptic number.

19804212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19804212 is an abundant number, since it is smaller than the sum of its proper divisors (30256526).

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

19804212 is a wasteful number, since it uses less digits than its factorization.

19804212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550127 (or 550122 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 19804212 is about 4450.1923553932. The cubic root of 19804212 is about 270.5531048539.

The spelling of 19804212 in words is "nineteen million, eight hundred four thousand, two hundred twelve".