1381285 has 4 divisors (see below), whose sum is σ = 1657548. Its totient is φ = 1105024.

The previous prime is 1381279. The next prime is 1381291. The reversal of 1381285 is 5821831.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1381279) and next prime (1381291).

It can be written as a sum of positive squares in 2 ways, for example, as 1014049 + 367236 = 1007^2 + 606^2 .

It is a cyclic number.

It is not a de Polignac number, because 1381285 - 2³ = 1381277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138124 + ... + 138133.

It is an arithmetic number, because the mean of its divisors is an integer number (414387).

2^1381285 is an apocalyptic number.

It is an amenable number.

1381285 is a deficient number, since it is larger than the sum of its proper divisors (276263).

1381285 is an equidigital number, since it uses as much as digits as its factorization.

1381285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276262.

The product of its digits is 1920, while the sum is 28.

The square root of 1381285 is about 1175.2808175070. The cubic root of 1381285 is about 111.3681738840.

The spelling of 1381285 in words is "one million, three hundred eighty-one thousand, two hundred eighty-five".