1289214720 has 432 divisors, whose sum is σ = 4907316960. Its totient is φ = 311033856.

The previous prime is 1289214697. The next prime is 1289214727. The reversal of 1289214720 is 274129821.

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

It is not an unprimeable number, because it can be changed into a prime (1289214727) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5679247 + ... + 5679473.

It is an arithmetic number, because the mean of its divisors is an integer number (11359530).

Almost surely, 2^1289214720 is an apocalyptic number.

1289214720 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 1289214720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2453658480).

1289214720 is an abundant number, since it is smaller than the sum of its proper divisors (3618102240).

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

1289214720 is a wasteful number, since it uses less digits than its factorization.

1289214720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300 (or 283 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 1289214720 is about 35905.6363263485. The cubic root of 1289214720 is about 1088.3662982327.

The spelling of 1289214720 in words is "one billion, two hundred eighty-nine million, two hundred fourteen thousand, seven hundred twenty".