19944191 has 8 divisors (see below), whose sum is σ = 20719104. Its totient is φ = 19177560.

The previous prime is 19944187. The next prime is 19944193. The reversal of 19944191 is 19144991.

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

It is a cyclic number.

It is not a de Polignac number, because 19944191 - 2² = 19944187 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19944193) 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, 3080 + ... + 7026.

It is an arithmetic number, because the mean of its divisors is an integer number (2589888).

Almost surely, 2^19944191 is an apocalyptic number.

19944191 is a deficient number, since it is larger than the sum of its proper divisors (774913).

19944191 is a wasteful number, since it uses less digits than its factorization.

19944191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4141.

The product of its digits is 11664, while the sum is 38.

The square root of 19944191 is about 4465.8919601800. The cubic root of 19944191 is about 271.1890448944.

The spelling of 19944191 in words is "nineteen million, nine hundred forty-four thousand, one hundred ninety-one".