1822779820 has 24 divisors (see below), whose sum is σ = 4029303600. Its totient is φ = 690737472.

The previous prime is 1822779817. The next prime is 1822779883. The reversal of 1822779820 is 289772281.

It is a happy 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, 2398015 + ... + 2398774.

It is an arithmetic number, because the mean of its divisors is an integer number (167887650).

Almost surely, 2^1822779820 is an apocalyptic number.

1822779820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1822779820 is an abundant number, since it is smaller than the sum of its proper divisors (2206523780).

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

1822779820 is a wasteful number, since it uses less digits than its factorization.

1822779820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4796817 (or 4796815 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 46.

The square root of 1822779820 is about 42694.0255773568. The cubic root of 1822779820 is about 1221.5504385350.

The spelling of 1822779820 in words is "one billion, eight hundred twenty-two million, seven hundred seventy-nine thousand, eight hundred twenty".