1228734972 has 72 divisors (see below), whose sum is σ = 3218866560. Its totient is φ = 394796160.

The previous prime is 1228734943. The next prime is 1228735007. The reversal of 1228734972 is 2794378221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 298158 + ... + 302250.

It is an arithmetic number, because the mean of its divisors is an integer number (44706480).

Almost surely, 2^1228734972 is an apocalyptic number.

1228734972 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 1228734972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1609433280).

1228734972 is an abundant number, since it is smaller than the sum of its proper divisors (1990131588).

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

1228734972 is a wasteful number, since it uses less digits than its factorization.

1228734972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4403 (or 4398 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 1228734972 is about 35053.3161341406. The cubic root of 1228734972 is about 1071.0738257505.

The spelling of 1228734972 in words is "one billion, two hundred twenty-eight million, seven hundred thirty-four thousand, nine hundred seventy-two".