1371665 has 4 divisors (see below), whose sum is σ = 1646004. Its totient is φ = 1097328.

The previous prime is 1371661. The next prime is 1371683. The reversal of 1371665 is 5661731.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1002001 + 369664 = 1001^2 + 608^2 .

It is a cyclic number.

It is not a de Polignac number, because 1371665 - 2² = 1371661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1371661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137162 + ... + 137171.

It is an arithmetic number, because the mean of its divisors is an integer number (411501).

2^1371665 is an apocalyptic number.

It is an amenable number.

1371665 is a deficient number, since it is larger than the sum of its proper divisors (274339).

1371665 is an equidigital number, since it uses as much as digits as its factorization.

1371665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274338.

The product of its digits is 3780, while the sum is 29.

The square root of 1371665 is about 1171.1810278518. The cubic root of 1371665 is about 111.1090290351.

The spelling of 1371665 in words is "one million, three hundred seventy-one thousand, six hundred sixty-five".