1389559808 has 136 divisors (see below), whose sum is σ = 3435108768. Its totient is φ = 547356672.

The previous prime is 1389559807. The next prime is 1389559819. The reversal of 1389559808 is 8089559831.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is not an unprimeable number, because it can be changed into a prime (1389559807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5963660 + ... + 5963892.

Almost surely, 2^1389559808 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 1389559808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1717554384).

1389559808 is an abundant number, since it is smaller than the sum of its proper divisors (2045548960).

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

1389559808 is an frugal number, since it uses more digits than its factorization.

1389559808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285 (or 255 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 56.

The square root of 1389559808 is about 37276.7998626492. The cubic root of 1389559808 is about 1115.9012086940.

The spelling of 1389559808 in words is "one billion, three hundred eighty-nine million, five hundred fifty-nine thousand, eight hundred eight".