1381565 has 8 divisors (see below), whose sum is σ = 1693440. Its totient is φ = 1081552.

The previous prime is 1381559. The next prime is 1381609. The reversal of 1381565 is 5651831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1381565 - 2¹² = 1377469 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2705 + ... + 3174.

It is an arithmetic number, because the mean of its divisors is an integer number (211680).

2^1381565 is an apocalyptic number.

It is an amenable number.

1381565 is a deficient number, since it is larger than the sum of its proper divisors (311875).

1381565 is an equidigital number, since it uses as much as digits as its factorization.

1381565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5931.

The product of its digits is 3600, while the sum is 29.

The square root of 1381565 is about 1175.3999319381. The cubic root of 1381565 is about 111.3756985155.

The spelling of 1381565 in words is "one million, three hundred eighty-one thousand, five hundred sixty-five".