1800434340 has 72 divisors (see below), whose sum is σ = 5527162368. Its totient is φ = 474327360.

The previous prime is 1800434329. The next prime is 1800434341. The reversal of 1800434340 is 434340081.

It is not an unprimeable number, because it can be changed into a prime (1800434341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45316 + ... + 75195.

It is an arithmetic number, because the mean of its divisors is an integer number (76766144).

Almost surely, 2^1800434340 is an apocalyptic number.

1800434340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1800434340 is an abundant number, since it is smaller than the sum of its proper divisors (3726728028).

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

1800434340 is a wasteful number, since it uses less digits than its factorization.

1800434340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120609 (or 120604 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 1800434340 is about 42431.5253084308. The cubic root of 1800434340 is about 1216.5382336021.

The spelling of 1800434340 in words is "one billion, eight hundred million, four hundred thirty-four thousand, three hundred forty".