1388944642 has 16 divisors (see below), whose sum is σ = 2208166272. Its totient is φ = 652970560.

The previous prime is 1388944633. The next prime is 1388944643. The reversal of 1388944642 is 2464498831.

It is not an unprimeable number, because it can be changed into a prime (1388944643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15243 + ... + 54865.

It is an arithmetic number, because the mean of its divisors is an integer number (138010392).

Almost surely, 2^1388944642 is an apocalyptic number.

1388944642 is a deficient number, since it is larger than the sum of its proper divisors (819221630).

1388944642 is a wasteful number, since it uses less digits than its factorization.

1388944642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40673.

The product of its digits is 1327104, while the sum is 49.

The square root of 1388944642 is about 37268.5476239684. The cubic root of 1388944642 is about 1115.7365124584.

The spelling of 1388944642 in words is "one billion, three hundred eighty-eight million, nine hundred forty-four thousand, six hundred forty-two".