19724497 has 12 divisors (see below), whose sum is σ = 21550080. Its totient is φ = 18044208.

The previous prime is 19724479. The next prime is 19724503. The reversal of 19724497 is 79442791.

It is not a de Polignac number, because 19724497 - 2¹¹ = 19722449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19724477) 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 11 ways as a sum of consecutive naturals, for example, 21004 + ... + 21922.

It is an arithmetic number, because the mean of its divisors is an integer number (1795840).

Almost surely, 2^19724497 is an apocalyptic number.

It is an amenable number.

19724497 is a deficient number, since it is larger than the sum of its proper divisors (1825583).

19724497 is a wasteful number, since it uses less digits than its factorization.

19724497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072 (or 1059 counting only the distinct ones).

The product of its digits is 127008, while the sum is 43.

The square root of 19724497 is about 4441.2269701063. The cubic root of 19724497 is about 270.1896107539.

The spelling of 19724497 in words is "nineteen million, seven hundred twenty-four thousand, four hundred ninety-seven".