1389857360 has 80 divisors (see below), whose sum is σ = 3320412480. Its totient is φ = 540718080.

The previous prime is 1389857323. The next prime is 1389857377. The reversal of 1389857360 is 637589831.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1389857360² = 3863406962292339200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1389857299 and 1389857308.

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, 2108711 + ... + 2109369.

It is an arithmetic number, because the mean of its divisors is an integer number (41505156).

Almost surely, 2^1389857360 is an apocalyptic number.

1389857360 is a gapful number since it is divisible by the number (10) 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 1389857360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1660206240).

1389857360 is an abundant number, since it is smaller than the sum of its proper divisors (1930555120).

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

1389857360 is a wasteful number, since it uses less digits than its factorization.

1389857360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356 (or 1350 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 50.

The square root of 1389857360 is about 37280.7907641455. The cubic root of 1389857360 is about 1115.9808538058.

The spelling of 1389857360 in words is "one billion, three hundred eighty-nine million, eight hundred fifty-seven thousand, three hundred sixty".