1821148140 has 96 divisors (see below), whose sum is σ = 5985229824. Its totient is φ = 405008640.

The previous prime is 1821148117. The next prime is 1821148141. The reversal of 1821148140 is 418411281.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1821148098 and 1821148107.

It is not an unprimeable number, because it can be changed into a prime (1821148141) 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, 43056 + ... + 74135.

It is an arithmetic number, because the mean of its divisors is an integer number (62346144).

Almost surely, 2^1821148140 is an apocalyptic number.

1821148140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1821148140 is an abundant number, since it is smaller than the sum of its proper divisors (4164081684).

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

1821148140 is a wasteful number, since it uses less digits than its factorization.

1821148140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117247 (or 117245 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 1821148140 is about 42674.9123021946. The cubic root of 1821148140 is about 1221.1858352641.

The spelling of 1821148140 in words is "one billion, eight hundred twenty-one million, one hundred forty-eight thousand, one hundred forty".