1823781820 has 24 divisors (see below), whose sum is σ = 4377076704. Its totient is φ = 625296576.

The previous prime is 1823781797. The next prime is 1823781857. The reversal of 1823781820 is 281873281.

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, 6513367 + ... + 6513646.

It is an arithmetic number, because the mean of its divisors is an integer number (182378196).

Almost surely, 2^1823781820 is an apocalyptic number.

1823781820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1823781820 is an abundant number, since it is smaller than the sum of its proper divisors (2553294884).

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

1823781820 is a wasteful number, since it uses less digits than its factorization.

1823781820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13027029 (or 13027027 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 1823781820 is about 42705.7586280820. The cubic root of 1823781820 is about 1221.7742302979.

The spelling of 1823781820 in words is "one billion, eight hundred twenty-three million, seven hundred eighty-one thousand, eight hundred twenty".