1389649284 has 135 divisors (see below), whose sum is σ = 3869579637. Its totient is φ = 434810592.

The previous prime is 1389649279. The next prime is 1389649297. The reversal of 1389649284 is 4829469831.

The square root of 1389649284 is 37278.

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., 968578884 + 421070400 = 31122^2 + 20520^2 .

It is a super-2 number, since 2×1389649284² = 3862250265043425312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 1389649284.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 12749022 + ... + 12749130.

Almost surely, 2^1389649284 is an apocalyptic number.

1389649284 is the 37278-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1389649284

1389649284 is an abundant number, since it is smaller than the sum of its proper divisors (2479930353).

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

1389649284 is a wasteful number, since it uses less digits than its factorization.

1389649284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 133 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 54.

The cubic root of 1389649284 is about 1115.9251597402.

The spelling of 1389649284 in words is "one billion, three hundred eighty-nine million, six hundred forty-nine thousand, two hundred eighty-four".