1811473640 has 32 divisors (see below), whose sum is σ = 4136654880. Its totient is φ = 713773632.

The previous prime is 1811473627. The next prime is 1811473649. The reversal of 1811473640 is 463741181.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1811473640.

It is not an unprimeable number, because it can be changed into a prime (1811473649) 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, 335282 + ... + 340641.

It is an arithmetic number, because the mean of its divisors is an integer number (129270465).

Almost surely, 2^1811473640 is an apocalyptic number.

1811473640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1811473640 is an abundant number, since it is smaller than the sum of its proper divisors (2325181240).

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

1811473640 is a wasteful number, since it uses less digits than its factorization.

1811473640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676001 (or 675997 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 1811473640 is about 42561.4102209971. The cubic root of 1811473640 is about 1219.0195562785.

The spelling of 1811473640 in words is "one billion, eight hundred eleven million, four hundred seventy-three thousand, six hundred forty".