1388381428 has 48 divisors (see below), whose sum is σ = 2869219584. Its totient is φ = 575527680.

The previous prime is 1388381341. The next prime is 1388381431. The reversal of 1388381428 is 8241838831.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

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, 98776 + ... + 111952.

It is an arithmetic number, because the mean of its divisors is an integer number (59775408).

Almost surely, 2^1388381428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1388381428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1434609792).

1388381428 is an abundant number, since it is smaller than the sum of its proper divisors (1480838156).

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

1388381428 is a wasteful number, since it uses less digits than its factorization.

1388381428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13312 (or 13310 counting only the distinct ones).

The product of its digits is 294912, while the sum is 46.

The square root of 1388381428 is about 37260.9907007315. The cubic root of 1388381428 is about 1115.5856825015.

The spelling of 1388381428 in words is "one billion, three hundred eighty-eight million, three hundred eighty-one thousand, four hundred twenty-eight".