1389210992 has 80 divisors (see below), whose sum is σ = 3094801920. Its totient is φ = 598752000.

The previous prime is 1389210989. The next prime is 1389211009. The reversal of 1389210992 is 2990129831.

It is a happy number.

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, 278117 + ... + 283067.

It is an arithmetic number, because the mean of its divisors is an integer number (38685024).

Almost surely, 2^1389210992 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 1389210992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1547400960).

1389210992 is an abundant number, since it is smaller than the sum of its proper divisors (1705590928).

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

1389210992 is a wasteful number, since it uses less digits than its factorization.

1389210992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5062 (or 5056 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 1389210992 is about 37272.1208411864. The cubic root of 1389210992 is about 1115.8078273779.

The spelling of 1389210992 in words is "one billion, three hundred eighty-nine million, two hundred ten thousand, nine hundred ninety-two".