1307745 has 20 divisors (see below), whose sum is σ = 2344980. Its totient is φ = 697248.

The previous prime is 1307741. The next prime is 1307753. The reversal of 1307745 is 5477031.

It can be written as a sum of positive squares in 2 ways, for example, as 431649 + 876096 = 657^2 + 936^2 .

It is not a de Polignac number, because 1307745 - 2² = 1307741 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1307741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1210 + ... + 2019.

It is an arithmetic number, because the mean of its divisors is an integer number (117249).

2^1307745 is an apocalyptic number.

1307745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1307745 is a deficient number, since it is larger than the sum of its proper divisors (1037235).

1307745 is an equidigital number, since it uses as much as digits as its factorization.

1307745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3246 (or 3237 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 1307745 is about 1143.5667886048. The cubic root of 1307745 is about 109.3555987356.

It can be divided in two parts, 130 and 7745, that added together give a triangular number (7875 = T₁₂₅).

The spelling of 1307745 in words is "one million, three hundred seven thousand, seven hundred forty-five".