18780023809 has 8 divisors (see below), whose sum is σ = 18838838528. Its totient is φ = 18721251360.

The previous prime is 18780023797. The next prime is 18780023819. The reversal of 18780023809 is 90832008781.

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 18780023809 - 2³¹ = 16632540161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18780023819) 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, 1039564 + ... + 1057474.

It is an arithmetic number, because the mean of its divisors is an integer number (2354854816).

Almost surely, 2^18780023809 is an apocalyptic number.

It is an amenable number.

18780023809 is a deficient number, since it is larger than the sum of its proper divisors (58814719).

18780023809 is a wasteful number, since it uses less digits than its factorization.

18780023809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21135.

The product of its (nonzero) digits is 193536, while the sum is 46.

The spelling of 18780023809 in words is "eighteen billion, seven hundred eighty million, twenty-three thousand, eight hundred nine".