18378634040 has 128 divisors (see below), whose sum is σ = 48043316160. Its totient is φ = 6266118144.

The previous prime is 18378634037. The next prime is 18378634121. The reversal of 18378634040 is 4043687381.

It is a junction number, because it is equal to n+sod(n) for n = 18378633982 and 18378634000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 448907 + ... + 488133.

Almost surely, 2^18378634040 is an apocalyptic number.

18378634040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18378634040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24021658080).

18378634040 is an abundant number, since it is smaller than the sum of its proper divisors (29664682120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18378634040 is a wasteful number, since it uses less digits than its factorization.

18378634040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39321 (or 39317 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 44.

The spelling of 18378634040 in words is "eighteen billion, three hundred seventy-eight million, six hundred thirty-four thousand, forty".