1001820840 has 64 divisors (see below), whose sum is σ = 3062188800. Its totient is φ = 262109952.

The previous prime is 1001820817. The next prime is 1001820851. The reversal of 1001820840 is 480281001.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1001820840.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72400 + ... + 85119.

It is an arithmetic number, because the mean of its divisors is an integer number (47846700).

Almost surely, 2^1001820840 is an apocalyptic number.

1001820840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001820840 is an abundant number, since it is smaller than the sum of its proper divisors (2060367960).

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

1001820840 is a wasteful number, since it uses less digits than its factorization.

1001820840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157586 (or 157582 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 1001820840 is about 31651.5535163758. The cubic root of 1001820840 is about 1000.6065786546.

The spelling of 1001820840 in words is "one billion, one million, eight hundred twenty thousand, eight hundred forty".