1380689 has 8 divisors (see below), whose sum is σ = 1472328. Its totient is φ = 1290240.

The previous prime is 1380679. The next prime is 1380707. The reversal of 1380689 is 9860831.

1380689 is nontrivially palindromic in base 16.

It can be written as a sum of positive squares in 4 ways, for example, as 380689 + 1000000 = 617^2 + 1000^2 .

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 1380689 - 2²⁰ = 332113 is a prime.

It is a super-2 number, since 2×1380689² = 3812604229442, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1380619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3929 + ... + 4265.

It is an arithmetic number, because the mean of its divisors is an integer number (184041).

2^1380689 is an apocalyptic number.

It is an amenable number.

1380689 is a deficient number, since it is larger than the sum of its proper divisors (91639).

1380689 is a wasteful number, since it uses less digits than its factorization.

1380689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 1380689 is about 1175.0272337269. The cubic root of 1380689 is about 111.3521537818.

The spelling of 1380689 in words is "one million, three hundred eighty thousand, six hundred eighty-nine".