1813368540 has 48 divisors (see below), whose sum is σ = 5163500160. Its totient is φ = 475368000.

The previous prime is 1813368509. The next prime is 1813368551. The reversal of 1813368540 is 458633181.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 252586 + ... + 259665.

It is an arithmetic number, because the mean of its divisors is an integer number (107572920).

Almost surely, 2^1813368540 is an apocalyptic number.

1813368540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1813368540 is an abundant number, since it is smaller than the sum of its proper divisors (3350131620).

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

1813368540 is a wasteful number, since it uses less digits than its factorization.

1813368540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512322 (or 512320 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 1813368540 is about 42583.6651780938. The cubic root of 1813368540 is about 1219.4444617514. Note that the first 4 decimals are identical.

The spelling of 1813368540 in words is "one billion, eight hundred thirteen million, three hundred sixty-eight thousand, five hundred forty".