18378634039 has 4 divisors (see below), whose sum is σ = 18379006360. Its totient is φ = 18378261720.

The previous prime is 18378634037. The next prime is 18378634121. The reversal of 18378634039 is 93043687381.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18378634039 - 2¹ = 18378634037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18378634031) 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, 98292 + ... + 215449.

It is an arithmetic number, because the mean of its divisors is an integer number (4594751590).

Almost surely, 2^18378634039 is an apocalyptic number.

18378634039 is a deficient number, since it is larger than the sum of its proper divisors (372321).

18378634039 is an equidigital number, since it uses as much as digits as its factorization.

18378634039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372320.

The product of its (nonzero) digits is 2612736, while the sum is 52.

The spelling of 18378634039 in words is "eighteen billion, three hundred seventy-eight million, six hundred thirty-four thousand, thirty-nine".