1378147 has 2 divisors, whose sum is σ = 1378148. Its totient is φ = 1378146.

The previous prime is 1378141. The next prime is 1378151. The reversal of 1378147 is 7418731.

It is a strong prime.

It is an emirp because it is prime and its reverse (7418731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1378147 - 2⁷ = 1378019 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1378141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689073 + 689074.

It is an arithmetic number, because the mean of its divisors is an integer number (689074).

2^1378147 is an apocalyptic number.

1378147 is the 628-th centered heptagonal number.

1378147 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378147 is an equidigital number, since it uses as much as digits as its factorization.

1378147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4704, while the sum is 31.

The square root of 1378147 is about 1173.9450583396. The cubic root of 1378147 is about 111.2837746209.

It can be divided in two parts, 1378 and 147, that multiplied together give a triangular number (202566 = T₆₃₆).

The spelling of 1378147 in words is "one million, three hundred seventy-eight thousand, one hundred forty-seven".