1815768380 has 12 divisors (see below), whose sum is σ = 3813113640. Its totient is φ = 726307344.

The previous prime is 1815768379. The next prime is 1815768433. The reversal of 1815768380 is 838675181.

It is a happy number.

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 3 ways as a sum of consecutive naturals, for example, 45394190 + ... + 45394229.

It is an arithmetic number, because the mean of its divisors is an integer number (317759470).

Almost surely, 2^1815768380 is an apocalyptic number.

1815768380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1815768380 is an abundant number, since it is smaller than the sum of its proper divisors (1997345260).

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

1815768380 is a wasteful number, since it uses less digits than its factorization.

1815768380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90788428 (or 90788426 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 47.

The square root of 1815768380 is about 42611.8338023606. The cubic root of 1815768380 is about 1219.9821685112.

The spelling of 1815768380 in words is "one billion, eight hundred fifteen million, seven hundred sixty-eight thousand, three hundred eighty".