1289157228 has 24 divisors (see below), whose sum is σ = 3342259760. Its totient is φ = 429719040.

The previous prime is 1289157217. The next prime is 1289157229. The reversal of 1289157228 is 8227519821.

It is not an unprimeable number, because it can be changed into a prime (1289157229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5968213 + ... + 5968428.

Almost surely, 2^1289157228 is an apocalyptic number.

1289157228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1289157228 is an abundant number, since it is smaller than the sum of its proper divisors (2053102532).

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

1289157228 is a wasteful number, since it uses less digits than its factorization.

1289157228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11936654 (or 11936646 counting only the distinct ones).

The product of its digits is 161280, while the sum is 45.

The square root of 1289157228 is about 35904.8357188833. The cubic root of 1289157228 is about 1088.3501195765.

The spelling of 1289157228 in words is "one billion, two hundred eighty-nine million, one hundred fifty-seven thousand, two hundred twenty-eight".