1388385872 has 10 divisors (see below), whose sum is σ = 2689997658. Its totient is φ = 694192928.

The previous prime is 1388385853. The next prime is 1388385881. The reversal of 1388385872 is 2785838831.

It can be written as a sum of positive squares in only one way, i.e., 768176656 + 620209216 = 27716^2 + 24904^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 43387043 + ... + 43387074.

Almost surely, 2^1388385872 is an apocalyptic number.

It is an amenable number.

1388385872 is a deficient number, since it is larger than the sum of its proper divisors (1301611786).

1388385872 is an equidigital number, since it uses as much as digits as its factorization.

1388385872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86774125 (or 86774119 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 53.

The square root of 1388385872 is about 37261.0503340955. The cubic root of 1388385872 is about 1115.5868727742.

The spelling of 1388385872 in words is "one billion, three hundred eighty-eight million, three hundred eighty-five thousand, eight hundred seventy-two".