1389657248 has 144 divisors (see below), whose sum is σ = 3463304040. Its totient is φ = 544997376.

The previous prime is 1389657229. The next prime is 1389657271. The reversal of 1389657248 is 8427569831.

It can be written as a sum of positive squares in 4 ways, for example, as 1223040784 + 166616464 = 34972^2 + 12908^2 .

It is a super-2 number, since 2×1389657248² = 3862294533837867008, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1389657248.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 985568 + ... + 986976.

Almost surely, 2^1389657248 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 1389657248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1731652020).

1389657248 is an abundant number, since it is smaller than the sum of its proper divisors (2073646792).

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

1389657248 is a wasteful number, since it uses less digits than its factorization.

1389657248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487 (or 1472 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 53.

The square root of 1389657248 is about 37278.1068188823. The cubic root of 1389657248 is about 1115.9272915037.

The spelling of 1389657248 in words is "one billion, three hundred eighty-nine million, six hundred fifty-seven thousand, two hundred forty-eight".