1381365 has 12 divisors (see below), whose sum is σ = 2394444. Its totient is φ = 736704.

The previous prime is 1381349. The next prime is 1381381. The reversal of 1381365 is 5631831.

It is an interprime number because it is at equal distance from previous prime (1381349) and next prime (1381381).

It can be written as a sum of positive squares in 2 ways, for example, as 285156 + 1096209 = 534^2 + 1047^2 .

It is not a de Polignac number, because 1381365 - 2⁴ = 1381349 is a prime.

It is a congruent 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, 15304 + ... + 15393.

It is an arithmetic number, because the mean of its divisors is an integer number (199537).

2^1381365 is an apocalyptic number.

1381365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1381365 is a deficient number, since it is larger than the sum of its proper divisors (1013079).

1381365 is a wasteful number, since it uses less digits than its factorization.

1381365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30708 (or 30705 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 1381365 is about 1175.3148514334. The cubic root of 1381365 is about 111.3703238825.

The spelling of 1381365 in words is "one million, three hundred eighty-one thousand, three hundred sixty-five".