1821299148 has 96 divisors (see below), whose sum is σ = 5048709120. Its totient is φ = 565781760.

The previous prime is 1821299147. The next prime is 1821299153. The reversal of 1821299148 is 8419921281.

It is a super-3 number, since 3×1821299148³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1821299147) 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, 184293 + ... + 193923.

It is an arithmetic number, because the mean of its divisors is an integer number (52590720).

Almost surely, 2^1821299148 is an apocalyptic number.

1821299148 is a gapful number since it is divisible by the number (18) 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 1821299148, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2524354560).

1821299148 is an abundant number, since it is smaller than the sum of its proper divisors (3227409972).

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

1821299148 is a wasteful number, since it uses less digits than its factorization.

1821299148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9764 (or 9756 counting only the distinct ones).

The product of its digits is 82944, while the sum is 45.

The square root of 1821299148 is about 42676.6815485928. The cubic root of 1821299148 is about 1221.2195875492.

The spelling of 1821299148 in words is "one billion, eight hundred twenty-one million, two hundred ninety-nine thousand, one hundred forty-eight".