1388928742 has 8 divisors (see below), whose sum is σ = 2098600776. Its totient is φ = 689395152.

The previous prime is 1388928731. The next prime is 1388928763. The reversal of 1388928742 is 2478298831.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1388928742.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 2534268 + ... + 2534815.

It is an arithmetic number, because the mean of its divisors is an integer number (262325097).

Almost surely, 2^1388928742 is an apocalyptic number.

1388928742 is a deficient number, since it is larger than the sum of its proper divisors (709672034).

1388928742 is a wasteful number, since it uses less digits than its factorization.

1388928742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5069222.

The product of its digits is 1548288, while the sum is 52.

The square root of 1388928742 is about 37268.3343067543. The cubic root of 1388928742 is about 1115.7322549625.

The spelling of 1388928742 in words is "one billion, three hundred eighty-eight million, nine hundred twenty-eight thousand, seven hundred forty-two".