1821913460 has 24 divisors (see below), whose sum is σ = 4051078920. Its totient is φ = 685896704.

The previous prime is 1821913459. The next prime is 1821913469. The reversal of 1821913460 is 643191281.

1821913460 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 960256144 + 861657316 = 30988^2 + 29354^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1821913460.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821913469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2678945 + ... + 2679624.

It is an arithmetic number, because the mean of its divisors is an integer number (168794955).

Almost surely, 2^1821913460 is an apocalyptic number.

1821913460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1821913460 is an abundant number, since it is smaller than the sum of its proper divisors (2229165460).

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

1821913460 is a wasteful number, since it uses less digits than its factorization.

1821913460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5358595 (or 5358593 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 1821913460 is about 42683.8782211739. The cubic root of 1821913460 is about 1221.3568751766.

The spelling of 1821913460 in words is "one billion, eight hundred twenty-one million, nine hundred thirteen thousand, four hundred sixty".