1289041920 has 288 divisors, whose sum is σ = 4553508960. Its totient is φ = 337182720.

The previous prime is 1289041889. The next prime is 1289041931. The reversal of 1289041920 is 291409821.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6543262 + ... + 6543458.

It is an arithmetic number, because the mean of its divisors is an integer number (15810795).

Almost surely, 2^1289041920 is an apocalyptic number.

1289041920 is a gapful number since it is divisible by the number (10) 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 1289041920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2276754480).

1289041920 is an abundant number, since it is smaller than the sum of its proper divisors (3264467040).

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

1289041920 is a wasteful number, since it uses less digits than its factorization.

1289041920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 1289041920 is about 35903.2299382660. The cubic root of 1289041920 is about 1088.3176696382.

The spelling of 1289041920 in words is "one billion, two hundred eighty-nine million, forty-one thousand, nine hundred twenty".