1388171429 has 2 divisors, whose sum is σ = 1388171430. Its totient is φ = 1388171428.

The previous prime is 1388171423. The next prime is 1388171443. The reversal of 1388171429 is 9241718831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1374407329 + 13764100 = 37073^2 + 3710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1388171429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1388171429.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1388171423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694085714 + 694085715.

It is an arithmetic number, because the mean of its divisors is an integer number (694085715).

Almost surely, 2^1388171429 is an apocalyptic number.

It is an amenable number.

1388171429 is a deficient number, since it is larger than the sum of its proper divisors (1).

1388171429 is an equidigital number, since it uses as much as digits as its factorization.

1388171429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 44.

The square root of 1388171429 is about 37258.1726470851. The cubic root of 1388171429 is about 1115.5294338642.

The spelling of 1388171429 in words is "one billion, three hundred eighty-eight million, one hundred seventy-one thousand, four hundred twenty-nine".