19713457 has 4 divisors (see below), whose sum is σ = 19724800. Its totient is φ = 19702116.

The previous prime is 19713451. The next prime is 19713487. The reversal of 19713457 is 75431791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 19713457 - 2¹⁹ = 19189169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19713451) 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, 2457 + ... + 6742.

It is an arithmetic number, because the mean of its divisors is an integer number (4931200).

Almost surely, 2^19713457 is an apocalyptic number.

It is an amenable number.

19713457 is a deficient number, since it is larger than the sum of its proper divisors (11343).

19713457 is an equidigital number, since it uses as much as digits as its factorization.

19713457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11342.

The product of its digits is 26460, while the sum is 37.

The square root of 19713457 is about 4439.9838963672. The cubic root of 19713457 is about 270.1391920623.

The spelling of 19713457 in words is "nineteen million, seven hundred thirteen thousand, four hundred fifty-seven".