1289238384 has 320 divisors, whose sum is σ = 4289725440. Its totient is φ = 325140480.

The previous prime is 1289238347. The next prime is 1289238403. The reversal of 1289238384 is 4838329821.

It is a super-2 number, since 2×1289238384² = 3324271221557862912, which contains 22 as substring.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

Its product of digits (663552) is a multiple of the sum of its prime factors (288).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7122774 + ... + 7122954.

It is an arithmetic number, because the mean of its divisors is an integer number (13405392).

Almost surely, 2^1289238384 is an apocalyptic number.

1289238384 is a gapful number since it is divisible by the number (14) 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 1289238384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2144862720).

1289238384 is an abundant number, since it is smaller than the sum of its proper divisors (3000487056).

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

1289238384 is a wasteful number, since it uses less digits than its factorization.

1289238384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288 (or 282 counting only the distinct ones).

The product of its digits is 663552, while the sum is 48.

The square root of 1289238384 is about 35905.9658552726. The cubic root of 1289238384 is about 1088.3729573103.

The spelling of 1289238384 in words is "one billion, two hundred eighty-nine million, two hundred thirty-eight thousand, three hundred eighty-four".