19891149 has 8 divisors (see below), whose sum is σ = 26582400. Its totient is φ = 13230336.

The previous prime is 19891141. The next prime is 19891153. The reversal of 19891149 is 94119891.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19891149 - 2³ = 19891141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19891149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19891141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6037 + ... + 8730.

It is an arithmetic number, because the mean of its divisors is an integer number (3322800).

Almost surely, 2^19891149 is an apocalyptic number.

It is an amenable number.

19891149 is a deficient number, since it is larger than the sum of its proper divisors (6691251).

19891149 is a wasteful number, since it uses less digits than its factorization.

19891149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15219.

The product of its digits is 23328, while the sum is 42.

The square root of 19891149 is about 4459.9494391753. The cubic root of 19891149 is about 270.9484204427.

The spelling of 19891149 in words is "nineteen million, eight hundred ninety-one thousand, one hundred forty-nine".