1811248840 has 32 divisors (see below), whose sum is σ = 4078500480. Its totient is φ = 723932352.

The previous prime is 1811248801. The next prime is 1811248843. The reversal of 1811248840 is 488421181.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1811248840.

It is not an unprimeable number, because it can be changed into a prime (1811248843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36019 + ... + 70141.

It is an arithmetic number, because the mean of its divisors is an integer number (127453140).

Almost surely, 2^1811248840 is an apocalyptic number.

1811248840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1811248840 is an abundant number, since it is smaller than the sum of its proper divisors (2267251640).

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

1811248840 is a wasteful number, since it uses less digits than its factorization.

1811248840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35461 (or 35457 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 37.

The square root of 1811248840 is about 42558.7692491219. The cubic root of 1811248840 is about 1218.9691282868.

The spelling of 1811248840 in words is "one billion, eight hundred eleven million, two hundred forty-eight thousand, eight hundred forty".