1813994040 has 32 divisors (see below), whose sum is σ = 5441982480. Its totient is φ = 483731712.

The previous prime is 1813993997. The next prime is 1813994071. The reversal of 1813994040 is 404993181.

1813994040 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 1813994040.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7558189 + ... + 7558428.

Almost surely, 2^1813994040 is an apocalyptic number.

1813994040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1813994040 is an abundant number, since it is smaller than the sum of its proper divisors (3627988440).

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

1813994040 is a wasteful number, since it uses less digits than its factorization.

1813994040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15116631 (or 15116627 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 1813994040 is about 42591.0089103322. The cubic root of 1813994040 is about 1219.5846566077.

The spelling of 1813994040 in words is "one billion, eight hundred thirteen million, nine hundred ninety-four thousand, forty".