1806546240 has 140 divisors (see below), whose sum is σ = 6426294996. Its totient is φ = 481738752.

The previous prime is 1806546221. The next prime is 1806546251. The reversal of 1806546240 is 426456081.

It can be written as a sum of positive squares in 2 ways, for example, as 1439747136 + 366799104 = 37944^2 + 19152^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 1806546195 and 1806546204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8929 + ... + 60768.

Almost surely, 2^1806546240 is an apocalyptic number.

1806546240 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 1806546240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3213147498).

1806546240 is an abundant number, since it is smaller than the sum of its proper divisors (4619748756).

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

1806546240 is an equidigital number, since it uses as much as digits as its factorization.

1806546240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69726 (or 69707 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 1806546240 is about 42503.4850335828. The cubic root of 1806546240 is about 1217.9132651964.

The spelling of 1806546240 in words is "one billion, eight hundred six million, five hundred forty-six thousand, two hundred forty".