1389178429 has 2 divisors, whose sum is σ = 1389178430. Its totient is φ = 1389178428.

The previous prime is 1389178381. The next prime is 1389178457. The reversal of 1389178429 is 9248719831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1326926329 + 62252100 = 36427^2 + 7890^2 .

It is a cyclic number.

It is not a de Polignac number, because 1389178429 - 2²¹ = 1387081277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1389178459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694589214 + 694589215.

It is an arithmetic number, because the mean of its divisors is an integer number (694589215).

Almost surely, 2^1389178429 is an apocalyptic number.

It is an amenable number.

1389178429 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389178429 is an equidigital number, since it uses as much as digits as its factorization.

1389178429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 52.

The square root of 1389178429 is about 37271.6840107876. The cubic root of 1389178429 is about 1115.7991091596.

The spelling of 1389178429 in words is "one billion, three hundred eighty-nine million, one hundred seventy-eight thousand, four hundred twenty-nine".