1381665 has 8 divisors (see below), whose sum is σ = 2210688. Its totient is φ = 736880.

The previous prime is 1381649. The next prime is 1381693. The reversal of 1381665 is 5661831.

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

It is not a de Polignac number, because 1381665 - 2⁴ = 1381649 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46041 + ... + 46070.

It is an arithmetic number, because the mean of its divisors is an integer number (276336).

2^1381665 is an apocalyptic number.

1381665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1381665 is a deficient number, since it is larger than the sum of its proper divisors (829023).

1381665 is an equidigital number, since it uses as much as digits as its factorization.

1381665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92119.

The product of its digits is 4320, while the sum is 30.

The square root of 1381665 is about 1175.4424698810. The cubic root of 1381665 is about 111.3783856375.

The spelling of 1381665 in words is "one million, three hundred eighty-one thousand, six hundred sixty-five".