19478275309 has 8 divisors (see below), whose sum is σ = 19872511488. Its totient is φ = 19087083840.

The previous prime is 19478275261. The next prime is 19478275373. The reversal of 19478275309 is 90357287491.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19478275309 - 2²¹ = 19476178157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19478275309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19478275409) 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, 748252 + ... + 773845.

It is an arithmetic number, because the mean of its divisors is an integer number (2484063936).

Almost surely, 2^19478275309 is an apocalyptic number.

It is an amenable number.

19478275309 is a deficient number, since it is larger than the sum of its proper divisors (394236179).

19478275309 is a wasteful number, since it uses less digits than its factorization.

19478275309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1522355.

The product of its (nonzero) digits is 3810240, while the sum is 55.

The spelling of 19478275309 in words is "nineteen billion, four hundred seventy-eight million, two hundred seventy-five thousand, three hundred nine".