1289228850 has 288 divisors, whose sum is σ = 4490129280. Its totient is φ = 257541120.

The previous prime is 1289228849. The next prime is 1289228861. The reversal of 1289228850 is 588229821.

It is a super-2 number, since 2×1289228850² = 3324222055344645000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 1289228796 and 1289228805.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 777222 + ... + 778878.

Almost surely, 2^1289228850 is an apocalyptic number.

1289228850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1289228850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2245064640).

1289228850 is an abundant number, since it is smaller than the sum of its proper divisors (3200900430).

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

1289228850 is a wasteful number, since it uses less digits than its factorization.

1289228850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714 (or 1706 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The square root of 1289228850 is about 35905.8330915744. The cubic root of 1289228850 is about 1088.3702744412.

The spelling of 1289228850 in words is "one billion, two hundred eighty-nine million, two hundred twenty-eight thousand, eight hundred fifty".