1378129 has 2 divisors, whose sum is σ = 1378130. Its totient is φ = 1378128.

The previous prime is 1378103. The next prime is 1378141. The reversal of 1378129 is 9218731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 774400 + 603729 = 880^2 + 777^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378129 - 2⁷ = 1378001 is a prime.

It is a Chen prime.

1378129 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1378129.

It is not a weakly prime, because it can be changed into another prime (1378189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689064 + 689065.

It is an arithmetic number, because the mean of its divisors is an integer number (689065).

2^1378129 is an apocalyptic number.

It is an amenable number.

1378129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378129 is an equidigital number, since it uses as much as digits as its factorization.

1378129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The square root of 1378129 is about 1173.9373918570. The cubic root of 1378129 is about 111.2832901257.

The spelling of 1378129 in words is "one million, three hundred seventy-eight thousand, one hundred twenty-nine".