1821453480 has 640 divisors, whose sum is σ = 7840800000. Its totient is φ = 375943680.

The previous prime is 1821453479. The next prime is 1821453481. The reversal of 1821453480 is 843541281.

It is an interprime number because it is at equal distance from previous prime (1821453479) and next prime (1821453481).

It is a super-2 number, since 2×1821453480² = 6635385559608220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821453481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 12224446 + ... + 12224594.

It is an arithmetic number, because the mean of its divisors is an integer number (12251250).

Almost surely, 2^1821453480 is an apocalyptic number.

1821453480 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 1821453480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3920400000).

1821453480 is an abundant number, since it is smaller than the sum of its proper divisors (6019346520).

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

1821453480 is a wasteful number, since it uses less digits than its factorization.

1821453480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 1821453480 is about 42678.4896639982. The cubic root of 1821453480 is about 1221.2540808646.

The spelling of 1821453480 in words is "one billion, eight hundred twenty-one million, four hundred fifty-three thousand, four hundred eighty".