1128721932 has 192 divisors, whose sum is σ = 3262694400. Its totient is φ = 337296960.

The previous prime is 1128721931. The next prime is 1128721939. The reversal of 1128721932 is 2391278211.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128721931) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15897457 + ... + 15897527.

It is an arithmetic number, because the mean of its divisors is an integer number (16993200).

Almost surely, 2^1128721932 is an apocalyptic number.

1128721932 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 1128721932, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1631347200).

1128721932 is an abundant number, since it is smaller than the sum of its proper divisors (2133972468).

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

1128721932 is a wasteful number, since it uses less digits than its factorization.

1128721932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190 (or 156 counting only the distinct ones).

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

The square root of 1128721932 is about 33596.4571346444. The cubic root of 1128721932 is about 1041.1876016655.

The spelling of 1128721932 in words is "one billion, one hundred twenty-eight million, seven hundred twenty-one thousand, nine hundred thirty-two".