1822185820 has 96 divisors (see below), whose sum is σ = 4730963328. Its totient is φ = 574083072.

The previous prime is 1822185773. The next prime is 1822185821. The reversal of 1822185820 is 285812281.

It is a super-2 number, since 2×1822185820² = 6640722325218144800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1822185820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1822185821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 421912 + ... + 426208.

It is an arithmetic number, because the mean of its divisors is an integer number (49280868).

Almost surely, 2^1822185820 is an apocalyptic number.

1822185820 is a gapful number since it is divisible by the number (10) 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 1822185820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2365481664).

1822185820 is an abundant number, since it is smaller than the sum of its proper divisors (2908777508).

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

1822185820 is a wasteful number, since it uses less digits than its factorization.

1822185820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4559 (or 4557 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 37.

The square root of 1822185820 is about 42687.0685336906. The cubic root of 1822185820 is about 1221.4177328391.

The spelling of 1822185820 in words is "one billion, eight hundred twenty-two million, one hundred eighty-five thousand, eight hundred twenty".