1388888705 has 8 divisors (see below), whose sum is σ = 1668988800. Its totient is φ = 1109562736.

The previous prime is 1388888701. The next prime is 1388888707. The reversal of 1388888705 is 5078888831.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1388888705 - 2² = 1388888701 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1388888701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189575 + ... + 196764.

It is an arithmetic number, because the mean of its divisors is an integer number (208623600).

Almost surely, 2^1388888705 is an apocalyptic number.

It is an amenable number.

1388888705 is a deficient number, since it is larger than the sum of its proper divisors (280100095).

1388888705 is an equidigital number, since it uses as much as digits as its factorization.

1388888705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387063.

The product of its (nonzero) digits is 3440640, while the sum is 56.

The square root of 1388888705 is about 37267.7971578681. The cubic root of 1388888705 is about 1115.7215342298.

The spelling of 1388888705 in words is "one billion, three hundred eighty-eight million, eight hundred eighty-eight thousand, seven hundred five".