1823857820 has 12 divisors (see below), whose sum is σ = 3830101464. Its totient is φ = 729543120.

The previous prime is 1823857807. The next prime is 1823857829. The reversal of 1823857820 is 287583281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1823857829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45596426 + ... + 45596465.

It is an arithmetic number, because the mean of its divisors is an integer number (319175122).

Almost surely, 2^1823857820 is an apocalyptic number.

1823857820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1823857820 is an abundant number, since it is smaller than the sum of its proper divisors (2006243644).

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

1823857820 is a wasteful number, since it uses less digits than its factorization.

1823857820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91192900 (or 91192898 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 44.

The square root of 1823857820 is about 42706.6484285527. The cubic root of 1823857820 is about 1221.7912011787.

The spelling of 1823857820 in words is "one billion, eight hundred twenty-three million, eight hundred fifty-seven thousand, eight hundred twenty".