1800312040 has 64 divisors (see below), whose sum is σ = 4134240000. Its totient is φ = 705419520.

The previous prime is 1800312037. The next prime is 1800312049. The reversal of 1800312040 is 402130081.

It is a super-2 number, since 2×1800312040² = 6482246882737923200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1800311999 and 1800312017.

It is not an unprimeable number, because it can be changed into a prime (1800312049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 411786 + ... + 416134.

It is an arithmetic number, because the mean of its divisors is an integer number (64597500).

Almost surely, 2^1800312040 is an apocalyptic number.

1800312040 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 1800312040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2067120000).

1800312040 is an abundant number, since it is smaller than the sum of its proper divisors (2333927960).

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

1800312040 is a wasteful number, since it uses less digits than its factorization.

1800312040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4570 (or 4566 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1800312040 is about 42430.0841384978. The cubic root of 1800312040 is about 1216.5106872870.

The spelling of 1800312040 in words is "one billion, eight hundred million, three hundred twelve thousand, forty".