1388890016 has 48 divisors (see below), whose sum is σ = 2861394984. Its totient is φ = 662897664.

The previous prime is 1388890003. The next prime is 1388890033. The reversal of 1388890016 is 6100988831.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1384137616 + 4752400 = 37204^2 + 2180^2 .

It is an unprimeable number.

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, 51686 + ... + 73818.

Almost surely, 2^1388890016 is an apocalyptic number.

1388890016 is a gapful number since it is divisible by the number (16) 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 1388890016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1430697492).

1388890016 is an abundant number, since it is smaller than the sum of its proper divisors (1472504968).

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

1388890016 is a wasteful number, since it uses less digits than its factorization.

1388890016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22233 (or 22225 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 44.

The square root of 1388890016 is about 37267.8147467758. The cubic root of 1388890016 is about 1115.7218852803.

The spelling of 1388890016 in words is "one billion, three hundred eighty-eight million, eight hundred ninety thousand, sixteen".