1813780736 has 144 divisors (see below), whose sum is σ = 4112855040. Its totient is φ = 793774080.

The previous prime is 1813780729. The next prime is 1813780747. The reversal of 1813780736 is 6370873181.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3467771 + ... + 3468293.

Almost surely, 2^1813780736 is an apocalyptic number.

1813780736 is a gapful number since it is divisible by the number (16) 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 1813780736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2056427520).

1813780736 is an abundant number, since it is smaller than the sum of its proper divisors (2299074304).

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

1813780736 is a wasteful number, since it uses less digits than its factorization.

1813780736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612 (or 598 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 1813780736 is about 42588.5047401291. The cubic root of 1813780736 is about 1219.5368518782.

The spelling of 1813780736 in words is "one billion, eight hundred thirteen million, seven hundred eighty thousand, seven hundred thirty-six".