1125404280 has 640 divisors, whose sum is σ = 5093383680. Its totient is φ = 215239680.

The previous prime is 1125404249. The next prime is 1125404339. The reversal of 1125404280 is 824045211.

1125404280 is a `hidden beast` number, since 1 + 1 + 2 + 540 + 42 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 3243067 + ... + 3243413.

It is an arithmetic number, because the mean of its divisors is an integer number (7958412).

Almost surely, 2^1125404280 is an apocalyptic number.

1125404280 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 1125404280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2546691840).

1125404280 is an abundant number, since it is smaller than the sum of its proper divisors (3967979400).

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

1125404280 is a wasteful number, since it uses less digits than its factorization.

1125404280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401 (or 388 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 1125404280 is about 33547.0457715728. The cubic root of 1125404280 is about 1040.1664797593.

Adding to 1125404280 its reverse (824045211), we get a palindrome (1949449491).

The spelling of 1125404280 in words is "one billion, one hundred twenty-five million, four hundred four thousand, two hundred eighty".