1389201984 has 63 divisors (see below), whose sum is σ = 3984462313. Its totient is φ = 462769152.

The previous prime is 1389201949. The next prime is 1389201991. The reversal of 1389201984 is 4891029831.

The square root of 1389201984 is 37272.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 141134400 + 1248067584 = 11880^2 + 35328^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 893752 + ... + 895304.

Almost surely, 2^1389201984 is an apocalyptic number.

1389201984 is the 37272-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1389201984

1389201984 is an abundant number, since it is smaller than the sum of its proper divisors (2595260329).

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

1389201984 is an frugal number, since it uses more digits than its factorization.

1389201984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3124 (or 1558 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The cubic root of 1389201984 is about 1115.8054156448.

The spelling of 1389201984 in words is "one billion, three hundred eighty-nine million, two hundred one thousand, nine hundred eighty-four".