19681404 has 48 divisors (see below), whose sum is σ = 47824896. Its totient is φ = 6292800.

The previous prime is 19681381. The next prime is 19681429. The reversal of 19681404 is 40418691.

It is a super-2 number, since 2×19681404² = 774715326822432, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70914 + ... + 71190.

It is an arithmetic number, because the mean of its divisors is an integer number (996352).

Almost surely, 2^19681404 is an apocalyptic number.

It is an amenable number.

19681404 is an abundant number, since it is smaller than the sum of its proper divisors (28143492).

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

19681404 is a wasteful number, since it uses less digits than its factorization.

19681404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506 (or 504 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 19681404 is about 4436.3728427624. The cubic root of 19681404 is about 269.9927021347.

The spelling of 19681404 in words is "nineteen million, six hundred eighty-one thousand, four hundred four".