1805340780 has 36 divisors (see below), whose sum is σ = 5476200912. Its totient is φ = 481424160.

The previous prime is 1805340773. The next prime is 1805340781. The reversal of 1805340780 is 870435081.

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (1805340781) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5014656 + ... + 5015015.

It is an arithmetic number, because the mean of its divisors is an integer number (152116692).

Almost surely, 2^1805340780 is an apocalyptic number.

1805340780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1805340780 is an abundant number, since it is smaller than the sum of its proper divisors (3670860132).

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

1805340780 is a wasteful number, since it uses less digits than its factorization.

1805340780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10029686 (or 10029681 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 1805340780 is about 42489.3019476668. The cubic root of 1805340780 is about 1217.6423112689.

The spelling of 1805340780 in words is "one billion, eight hundred five million, three hundred forty thousand, seven hundred eighty".