1387305 has 12 divisors (see below), whose sum is σ = 2404740. Its totient is φ = 739872.

The previous prime is 1387289. The next prime is 1387313. The reversal of 1387305 is 5037831.

It can be written as a sum of positive squares in 2 ways, for example, as 898704 + 488601 = 948^2 + 699^2 .

It is not a de Polignac number, because 1387305 - 2⁴ = 1387289 is a prime.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15370 + ... + 15459.

It is an arithmetic number, because the mean of its divisors is an integer number (200395).

2^1387305 is an apocalyptic number.

1387305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1387305 is a deficient number, since it is larger than the sum of its proper divisors (1017435).

1387305 is a wasteful number, since it uses less digits than its factorization.

1387305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30840 (or 30837 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 1387305 is about 1177.8391231403. The cubic root of 1387305 is about 111.5297299180.

The spelling of 1387305 in words is "one million, three hundred eighty-seven thousand, three hundred five".