1389505536 has 176 divisors, whose sum is σ = 4259397600. Its totient is φ = 446939136.

The previous prime is 1389505499. The next prime is 1389505541. The reversal of 1389505536 is 6355059831.

1389505536 is a `hidden beast` number, since 1 + 3 + 8 + 95 + 0 + 553 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1389505491 and 1389505500.

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, 800926 + ... + 802658.

Almost surely, 2^1389505536 is an apocalyptic number.

1389505536 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 1389505536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2129698800).

1389505536 is an abundant number, since it is smaller than the sum of its proper divisors (2869892064).

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

1389505536 is a wasteful number, since it uses less digits than its factorization.

1389505536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791 (or 1767 counting only the distinct ones).

The product of its (nonzero) digits is 486000, while the sum is 45.

The square root of 1389505536 is about 37276.0718960569. The cubic root of 1389505536 is about 1115.8866805970.

It can be divided in two parts, 1389505 and 536, that added together give a square (1390041 = 1179²).

The spelling of 1389505536 in words is "one billion, three hundred eighty-nine million, five hundred five thousand, five hundred thirty-six".