1345780 has 12 divisors (see below), whose sum is σ = 2826180. Its totient is φ = 538304.

The previous prime is 1345777. The next prime is 1345781. The reversal of 1345780 is 875431.

It can be written as a sum of positive squares in 2 ways, for example, as 272484 + 1073296 = 522^2 + 1036^2 .

It is a super-2 number, since 2×1345780² = 3622247616800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1345781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33625 + ... + 33664.

It is an arithmetic number, because the mean of its divisors is an integer number (235515).

2^1345780 is an apocalyptic number.

1345780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1345780 is an abundant number, since it is smaller than the sum of its proper divisors (1480400).

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

1345780 is a wasteful number, since it uses less digits than its factorization.

1345780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67298 (or 67296 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 1345780 is about 1160.0775836124. The cubic root of 1345780 is about 110.4056646607.

The spelling of 1345780 in words is "one million, three hundred forty-five thousand, seven hundred eighty".