1227889152 has 160 divisors (see below), whose sum is σ = 4154198400. Its totient is φ = 350797824.

The previous prime is 1227889151. The next prime is 1227889163. The reversal of 1227889152 is 2519887221.

It is a junction number, because it is equal to n+sod(n) for n = 1227889098 and 1227889107.

It is not an unprimeable number, because it can be changed into a prime (1227889151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90424 + ... + 103112.

It is an arithmetic number, because the mean of its divisors is an integer number (25963740).

Almost surely, 2^1227889152 is an apocalyptic number.

1227889152 is a gapful number since it is divisible by the number (12) 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 1227889152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2077099200).

1227889152 is an abundant number, since it is smaller than the sum of its proper divisors (2926309248).

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

1227889152 is an equidigital number, since it uses as much as digits as its factorization.

1227889152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12723 (or 12701 counting only the distinct ones).

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

The square root of 1227889152 is about 35041.2492927978. The cubic root of 1227889152 is about 1070.8280055545.

The spelling of 1227889152 in words is "one billion, two hundred twenty-seven million, eight hundred eighty-nine thousand, one hundred fifty-two".