19491672 has 32 divisors (see below), whose sum is σ = 50849280. Its totient is φ = 6214560.

The previous prime is 19491671. The next prime is 19491679. The reversal of 19491672 is 27619491.

It is a self number, because there is not a number n which added to its sum of digits gives 19491672.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19491671) 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, 17104 + ... + 18207.

It is an arithmetic number, because the mean of its divisors is an integer number (1589040).

Almost surely, 2^19491672 is an apocalyptic number.

19491672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19491672 is an abundant number, since it is smaller than the sum of its proper divisors (31357608).

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

19491672 is a wasteful number, since it uses less digits than its factorization.

19491672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35343 (or 35339 counting only the distinct ones).

The product of its digits is 27216, while the sum is 39.

The square root of 19491672 is about 4414.9373721492. The cubic root of 19491672 is about 269.1223077169.

The spelling of 19491672 in words is "nineteen million, four hundred ninety-one thousand, six hundred seventy-two".