1378613 has 2 divisors, whose sum is σ = 1378614. Its totient is φ = 1378612.

The previous prime is 1378603. The next prime is 1378639. The reversal of 1378613 is 3168731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 850084 + 528529 = 922^2 + 727^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378613 - 2¹⁰ = 1377589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1378603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689306 + 689307.

It is an arithmetic number, because the mean of its divisors is an integer number (689307).

2^1378613 is an apocalyptic number.

It is an amenable number.

1378613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378613 is an equidigital number, since it uses as much as digits as its factorization.

1378613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 29.

The square root of 1378613 is about 1174.1435176332. The cubic root of 1378613 is about 111.2963161942.

It can be divided in two parts, 1378 and 613, that added together give a palindrome (1991).

The spelling of 1378613 in words is "one million, three hundred seventy-eight thousand, six hundred thirteen".