1388668732 has 48 divisors (see below), whose sum is σ = 2954810880. Its totient is φ = 562809600.

The previous prime is 1388668727. The next prime is 1388668753. The reversal of 1388668732 is 2378668831.

It is a self number, because there is not a number n which added to its sum of digits gives 1388668732.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34644 + ... + 63067.

It is an arithmetic number, because the mean of its divisors is an integer number (61558560).

Almost surely, 2^1388668732 is an apocalyptic number.

It is an amenable number.

1388668732 is an abundant number, since it is smaller than the sum of its proper divisors (1566142148).

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

1388668732 is a wasteful number, since it uses less digits than its factorization.

1388668732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97762 (or 97760 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 52.

The square root of 1388668732 is about 37264.8457933211. The cubic root of 1388668732 is about 1115.6626282449.

Subtracting 1388668732 from its reverse (2378668831), we obtain a palindrome (990000099).

The spelling of 1388668732 in words is "one billion, three hundred eighty-eight million, six hundred sixty-eight thousand, seven hundred thirty-two".