1813394740 has 48 divisors (see below), whose sum is σ = 3906512064. Its totient is φ = 706668800.

The previous prime is 1813394729. The next prime is 1813394747. The reversal of 1813394740 is 474933181.

It is a junction number, because it is equal to n+sod(n) for n = 1813394693 and 1813394702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813394747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 893607 + ... + 895633.

It is an arithmetic number, because the mean of its divisors is an integer number (81385668).

Almost surely, 2^1813394740 is an apocalyptic number.

1813394740 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 1813394740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1953256032).

1813394740 is an abundant number, since it is smaller than the sum of its proper divisors (2093117324).

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

1813394740 is a wasteful number, since it uses less digits than its factorization.

1813394740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3168 (or 3166 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 1813394740 is about 42583.9728066793. The cubic root of 1813394740 is about 1219.4503346688.

The spelling of 1813394740 in words is "one billion, eight hundred thirteen million, three hundred ninety-four thousand, seven hundred forty".