1378345 has 4 divisors (see below), whose sum is σ = 1654020. Its totient is φ = 1102672.

The previous prime is 1378339. The next prime is 1378373. The reversal of 1378345 is 5438731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5438731 = 19 ⋅286249.

It can be written as a sum of positive squares in 2 ways, for example, as 419904 + 958441 = 648^2 + 979^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378345 - 2³ = 1378337 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137830 + ... + 137839.

It is an arithmetic number, because the mean of its divisors is an integer number (413505).

2^1378345 is an apocalyptic number.

It is an amenable number.

1378345 is a deficient number, since it is larger than the sum of its proper divisors (275675).

1378345 is an equidigital number, since it uses as much as digits as its factorization.

1378345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275674.

The product of its digits is 10080, while the sum is 31.

The square root of 1378345 is about 1174.0293863443. The cubic root of 1378345 is about 111.2891037893.

The spelling of 1378345 in words is "one million, three hundred seventy-eight thousand, three hundred forty-five".