19901384 has 8 divisors (see below), whose sum is σ = 37315110. Its totient is φ = 9950688.

The previous prime is 19901383. The next prime is 19901419. The reversal of 19901384 is 48310991.

It can be written as a sum of positive squares in only one way, i.e., 16176484 + 3724900 = 4022^2 + 1930^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (19901383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1243829 + ... + 1243844.

Almost surely, 2^19901384 is an apocalyptic number.

It is an amenable number.

19901384 is a deficient number, since it is larger than the sum of its proper divisors (17413726).

19901384 is a wasteful number, since it uses less digits than its factorization.

19901384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2487679 (or 2487675 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 19901384 is about 4461.0967261426. The cubic root of 19901384 is about 270.9948846862.

The spelling of 19901384 in words is "nineteen million, nine hundred one thousand, three hundred eighty-four".