1228931172 has 216 divisors, whose sum is σ = 3910583040. Its totient is φ = 323326080.

The previous prime is 1228931149. The next prime is 1228931203. The reversal of 1228931172 is 2711398221.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1239597 + ... + 1240587.

Almost surely, 2^1228931172 is an apocalyptic number.

1228931172 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 1228931172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1955291520).

1228931172 is an abundant number, since it is smaller than the sum of its proper divisors (2681651868).

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

1228931172 is a wasteful number, since it uses less digits than its factorization.

1228931172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071 (or 1059 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 1228931172 is about 35056.1146164260. The cubic root of 1228931172 is about 1071.1308311274.

The spelling of 1228931172 in words is "one billion, two hundred twenty-eight million, nine hundred thirty-one thousand, one hundred seventy-two".