1389903744 has 128 divisors (see below), whose sum is σ = 3795379200. Its totient is φ = 450514944.

The previous prime is 1389903709. The next prime is 1389903761. The reversal of 1389903744 is 4473099831.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 1389903693 and 1389903702.

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, 2289489 + ... + 2290095.

It is an arithmetic number, because the mean of its divisors is an integer number (29651400).

Almost surely, 2^1389903744 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 1389903744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1897689600).

1389903744 is an abundant number, since it is smaller than the sum of its proper divisors (2405475456).

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

1389903744 is an equidigital number, since it uses as much as digits as its factorization.

1389903744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780 (or 768 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 48.

The square root of 1389903744 is about 37281.4128487642. The cubic root of 1389903744 is about 1115.9932682884.

The spelling of 1389903744 in words is "one billion, three hundred eighty-nine million, nine hundred three thousand, seven hundred forty-four".