19748069 has 4 divisors (see below), whose sum is σ = 21543360. Its totient is φ = 17952780.

The previous prime is 19748039. The next prime is 19748077. The reversal of 19748069 is 96084791.

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 an emirpimes, since its reverse is a distinct semiprime: 96084791 = 11 ⋅8734981.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19748069 is a prime.

It is a super-2 number, since 2×19748069² = 779972458457522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19748009) 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, 897629 + ... + 897650.

It is an arithmetic number, because the mean of its divisors is an integer number (5385840).

Almost surely, 2^19748069 is an apocalyptic number.

It is an amenable number.

19748069 is a deficient number, since it is larger than the sum of its proper divisors (1795291).

19748069 is a wasteful number, since it uses less digits than its factorization.

19748069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795290.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 19748069 is about 4443.8799488735. The cubic root of 19748069 is about 270.2971990337.

The spelling of 19748069 in words is "nineteen million, seven hundred forty-eight thousand, sixty-nine".