1815013399000 has 128 divisors (see below), whose sum is σ = 4533635059200. Its totient is φ = 678106800000.

The previous prime is 1815013398977. The next prime is 1815013399021. The reversal of 1815013399000 is 9933105181.

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 676275 + ... + 2021725.

It is an arithmetic number, because the mean of its divisors is an integer number (35419023900).

Almost surely, 2^{1815013399000} is an apocalyptic number.

1815013399000 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 1815013399000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2266817529600).

1815013399000 is an abundant number, since it is smaller than the sum of its proper divisors (2718621660200).

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

1815013399000 is a wasteful number, since it uses less digits than its factorization.

1815013399000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345562 (or 1345548 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 40.

The spelling of 1815013399000 in words is "one trillion, eight hundred fifteen billion, thirteen million, three hundred ninety-nine thousand".