1380681 has 6 divisors (see below), whose sum is σ = 1994330. Its totient is φ = 920448.

The previous prime is 1380679. The next prime is 1380707. The reversal of 1380681 is 1860831.

It can be written as a sum of positive squares in only one way, i.e., 1334025 + 46656 = 1155^2 + 216^2 .

It is not a de Polignac number, because 1380681 - 2¹ = 1380679 is a prime.

It is a super-2 number, since 2×1380681² = 3812560047522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1380611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 76696 + ... + 76713.

2^1380681 is an apocalyptic number.

It is an amenable number.

1380681 is a deficient number, since it is larger than the sum of its proper divisors (613649).

1380681 is a wasteful number, since it uses less digits than its factorization.

1380681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153415 (or 153412 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1380681 is about 1175.0238295456. The cubic root of 1380681 is about 111.3519387155.

The spelling of 1380681 in words is "one million, three hundred eighty thousand, six hundred eighty-one".