1800340440 has 64 divisors (see below), whose sum is σ = 5685292800. Its totient is φ = 454822272.

The previous prime is 1800340391. The next prime is 1800340457. The reversal of 1800340440 is 440430081.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1800340440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 392532 + ... + 397091.

It is an arithmetic number, because the mean of its divisors is an integer number (88832700).

Almost surely, 2^1800340440 is an apocalyptic number.

1800340440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1800340440 is an abundant number, since it is smaller than the sum of its proper divisors (3884952360).

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

1800340440 is a wasteful number, since it uses less digits than its factorization.

1800340440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789656 (or 789652 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 1800340440 is about 42430.4188053807. The cubic root of 1800340440 is about 1216.5170840895.

The spelling of 1800340440 in words is "one billion, eight hundred million, three hundred forty thousand, four hundred forty".