1388089752 has 64 divisors (see below), whose sum is σ = 3991307520. Its totient is φ = 394063488.

The previous prime is 1388089741. The next prime is 1388089793. The reversal of 1388089752 is 2579808831.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1388089695 and 1388089704.

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, 63 + ... + 52689.

It is an arithmetic number, because the mean of its divisors is an integer number (62364180).

Almost surely, 2^1388089752 is an apocalyptic number.

1388089752 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1388089752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1995653760).

1388089752 is an abundant number, since it is smaller than the sum of its proper divisors (2603217768).

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

1388089752 is a wasteful number, since it uses less digits than its factorization.

1388089752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52800 (or 52796 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 51.

The square root of 1388089752 is about 37257.0765358744. The cubic root of 1388089752 is about 1115.5075549899.

The spelling of 1388089752 in words is "one billion, three hundred eighty-eight million, eighty-nine thousand, seven hundred fifty-two".