1378387 has 2 divisors, whose sum is σ = 1378388. Its totient is φ = 1378386.

The previous prime is 1378373. The next prime is 1378397. The reversal of 1378387 is 7838731.

It is a strong prime.

It is an emirp because it is prime and its reverse (7838731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1378387 - 2¹¹ = 1376339 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1378337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689193 + 689194.

It is an arithmetic number, because the mean of its divisors is an integer number (689194).

2^1378387 is an apocalyptic number.

1378387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378387 is an equidigital number, since it uses as much as digits as its factorization.

1378387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 37.

The square root of 1378387 is about 1174.0472733242. The cubic root of 1378387 is about 111.2902341533.

It can be divided in two parts, 13 and 78387, that added together give a square (78400 = 280²).

The spelling of 1378387 in words is "one million, three hundred seventy-eight thousand, three hundred eighty-seven".