2018385640 has 32 divisors (see below), whose sum is σ = 4574052000. Its totient is φ = 801543744.

The previous prime is 2018385583. The next prime is 2018385641. The reversal of 2018385640 is 465838102.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2018385640.

It is not an unprimeable number, because it can be changed into a prime (2018385641) 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, 175950 + ... + 187069.

It is an arithmetic number, because the mean of its divisors is an integer number (142939125).

Almost surely, 2^2018385640 is an apocalyptic number.

2018385640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2018385640 is an abundant number, since it is smaller than the sum of its proper divisors (2555666360).

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

2018385640 is a wasteful number, since it uses less digits than its factorization.

2018385640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363169 (or 363165 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 2018385640 is about 44926.4469995124. The cubic root of 2018385640 is about 1263.7700220513.

The spelling of 2018385640 in words is "two billion, eighteen million, three hundred eighty-five thousand, six hundred forty".