1305780 has 48 divisors (see below), whose sum is σ = 4179840. Its totient is φ = 298368.

The previous prime is 1305749. The next prime is 1305797. The reversal of 1305780 is 875031.

It is a super-2 number, since 2×1305780² = 3410122816800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1305780.

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, 1135 + ... + 1974.

It is an arithmetic number, because the mean of its divisors is an integer number (87080).

2^1305780 is an apocalyptic number.

1305780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1305780 is an abundant number, since it is smaller than the sum of its proper divisors (2874060).

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

1305780 is a wasteful number, since it uses less digits than its factorization.

1305780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3128 (or 3126 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 1305780 is about 1142.7073116070. The cubic root of 1305780 is about 109.3007991968.

The spelling of 1305780 in words is "one million, three hundred five thousand, seven hundred eighty".