1389726180 has 96 divisors (see below), whose sum is σ = 4344439680. Its totient is φ = 368807040.

The previous prime is 1389726167. The next prime is 1389726193. The reversal of 1389726180 is 816279831.

1389726180 is a `hidden beast` number, since 1 + 389 + 7 + 261 + 8 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1389726167) and next prime (1389726193).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 107842 + ... + 120038.

It is an arithmetic number, because the mean of its divisors is an integer number (45254580).

Almost surely, 2^1389726180 is an apocalyptic number.

1389726180 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 1389726180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2172219840).

1389726180 is an abundant number, since it is smaller than the sum of its proper divisors (2954713500).

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

1389726180 is a wasteful number, since it uses less digits than its factorization.

1389726180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12426 (or 12418 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 1389726180 is about 37279.0313715365. The cubic root of 1389726180 is about 1115.9457425350.

The spelling of 1389726180 in words is "one billion, three hundred eighty-nine million, seven hundred twenty-six thousand, one hundred eighty".