18875390387 has 4 divisors (see below), whose sum is σ = 21571874736. Its totient is φ = 16178906040.

The previous prime is 18875390363. The next prime is 18875390393. The reversal of 18875390387 is 78309357881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78309357881 = 2953 ⋅26518577.

It is a cyclic number.

It is not a de Polignac number, because 18875390387 - 2⁶ = 18875390323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18875390327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1348242164 + ... + 1348242177.

It is an arithmetic number, because the mean of its divisors is an integer number (5392968684).

Almost surely, 2^18875390387 is an apocalyptic number.

18875390387 is a deficient number, since it is larger than the sum of its proper divisors (2696484349).

18875390387 is an equidigital number, since it uses as much as digits as its factorization.

18875390387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2696484348.

The product of its (nonzero) digits is 10160640, while the sum is 59.

The spelling of 18875390387 in words is "eighteen billion, eight hundred seventy-five million, three hundred ninety thousand, three hundred eighty-seven".