1388171742 has 16 divisors (see below), whose sum is σ = 2777138832. Its totient is φ = 462591360.

The previous prime is 1388171731. The next prime is 1388171747. The reversal of 1388171742 is 2471718831.

It is a junction number, because it is equal to n+sod(n) for n = 1388171694 and 1388171703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388171747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9109 + ... + 53472.

It is an arithmetic number, because the mean of its divisors is an integer number (173571177).

Almost surely, 2^1388171742 is an apocalyptic number.

1388171742 is an abundant number, since it is smaller than the sum of its proper divisors (1388967090).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1388171742 is a wasteful number, since it uses less digits than its factorization.

1388171742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66283.

The product of its digits is 75264, while the sum is 42.

The square root of 1388171742 is about 37258.1768475056. The cubic root of 1388171742 is about 1115.5295177061.

The spelling of 1388171742 in words is "one billion, three hundred eighty-eight million, one hundred seventy-one thousand, seven hundred forty-two".