19400668 has 54 divisors (see below), whose sum is σ = 41205528. Its totient is φ = 7968240.

The previous prime is 19400659. The next prime is 19400671. The reversal of 19400668 is 86600491.

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 17 ways as a sum of consecutive naturals, for example, 188305 + ... + 188407.

Almost surely, 2^19400668 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 19400668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20602764).

19400668 is an abundant number, since it is smaller than the sum of its proper divisors (21804860).

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

19400668 is a wasteful number, since it uses less digits than its factorization.

19400668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 19400668 is about 4404.6189392500. The cubic root of 19400668 is about 268.7028222216.

The spelling of 19400668 in words is "nineteen million, four hundred thousand, six hundred sixty-eight".