19491964 has 12 divisors (see below), whose sum is σ = 34188784. Its totient is φ = 9723744.

The previous prime is 19491961. The next prime is 19491977. The reversal of 19491964 is 46919491.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 19491964.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19491961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3504 + ... + 7159.

Almost surely, 2^19491964 is an apocalyptic number.

It is an amenable number.

19491964 is a deficient number, since it is larger than the sum of its proper divisors (14696820).

19491964 is a wasteful number, since it uses less digits than its factorization.

19491964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11124 (or 11122 counting only the distinct ones).

The product of its digits is 69984, while the sum is 43.

The square root of 19491964 is about 4414.9704415772. The cubic root of 19491964 is about 269.1236515955.

The spelling of 19491964 in words is "nineteen million, four hundred ninety-one thousand, nine hundred sixty-four".