19381668 has 12 divisors (see below), whose sum is σ = 45223920. Its totient is φ = 6460552.

The previous prime is 19381633. The next prime is 19381669. The reversal of 19381668 is 86618391.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (19381669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 807558 + ... + 807581.

It is an arithmetic number, because the mean of its divisors is an integer number (3768660).

Almost surely, 2^19381668 is an apocalyptic number.

It is an amenable number.

19381668 is an abundant number, since it is smaller than the sum of its proper divisors (25842252).

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

19381668 is a wasteful number, since it uses less digits than its factorization.

19381668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1615146 (or 1615144 counting only the distinct ones).

The product of its digits is 62208, while the sum is 42.

The square root of 19381668 is about 4402.4615841595. The cubic root of 19381668 is about 268.6150757384.

The spelling of 19381668 in words is "nineteen million, three hundred eighty-one thousand, six hundred sixty-eight".