1128397500 has 240 divisors, whose sum is σ = 3721933600. Its totient is φ = 295488000.

The previous prime is 1128397493. The next prime is 1128397513. The reversal of 1128397500 is 57938211.

1128397500 is a `hidden beast` number, since 112 + 8 + 39 + 7 + 500 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 4927386 + ... + 4927614.

Almost surely, 2^1128397500 is an apocalyptic number.

1128397500 is a gapful number since it is divisible by the number (10) 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 1128397500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1860966800).

1128397500 is an abundant number, since it is smaller than the sum of its proper divisors (2593536100).

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

1128397500 is a wasteful number, since it uses less digits than its factorization.

1128397500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335 (or 312 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 1128397500 is about 33591.6284213790. The cubic root of 1128397500 is about 1041.0878348596.

The spelling of 1128397500 in words is "one billion, one hundred twenty-eight million, three hundred ninety-seven thousand, five hundred".