1380665 has 16 divisors (see below), whose sum is σ = 1947456. Its totient is φ = 926400.

The previous prime is 1380653. The next prime is 1380671. The reversal of 1380665 is 5660831.

It is not a de Polignac number, because 1380665 - 2¹⁰ = 1379641 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 251 + ... + 1680.

It is an arithmetic number, because the mean of its divisors is an integer number (121716).

2^1380665 is an apocalyptic number.

It is an amenable number.

1380665 is a deficient number, since it is larger than the sum of its proper divisors (566791).

1380665 is a wasteful number, since it uses less digits than its factorization.

1380665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1960.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1380665 is about 1175.0170211533. The cubic root of 1380665 is about 111.3515085805.

The spelling of 1380665 in words is "one million, three hundred eighty thousand, six hundred sixty-five".