1375665 has 8 divisors (see below), whose sum is σ = 2201088. Its totient is φ = 733680.

The previous prime is 1375639. The next prime is 1375669. The reversal of 1375665 is 5665731.

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

It is not a de Polignac number, because 1375665 - 2⁶ = 1375601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1375669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45841 + ... + 45870.

It is an arithmetic number, because the mean of its divisors is an integer number (275136).

2^1375665 is an apocalyptic number.

1375665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1375665 is a deficient number, since it is larger than the sum of its proper divisors (825423).

1375665 is an equidigital number, since it uses as much as digits as its factorization.

1375665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91719.

The product of its digits is 18900, while the sum is 33.

The square root of 1375665 is about 1172.8874626323. The cubic root of 1375665 is about 111.2169282666.

The spelling of 1375665 in words is "one million, three hundred seventy-five thousand, six hundred sixty-five".