1125720 has 96 divisors (see below), whose sum is σ = 3790800. Its totient is φ = 289536.

The previous prime is 1125713. The next prime is 1125739. The reversal of 1125720 is 275211.

It is a Cunningham number, because it is equal to 1061²-1.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1125693 and 1125702.

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, 19051 + ... + 19109.

2^1125720 is an apocalyptic number.

1125720 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 1125720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1895400).

1125720 is an abundant number, since it is smaller than the sum of its proper divisors (2665080).

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

1125720 is a wasteful number, since it uses less digits than its factorization.

1125720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129 (or 122 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 1125720 is about 1060.9995287464. Note that the first 3 decimals coincide. The cubic root of 1125720 is about 104.0263739817.

It can be divided in two parts, 1125 and 720, that multiplied together give a 4-th power (810000 = 30⁴).

The spelling of 1125720 in words is "one million, one hundred twenty-five thousand, seven hundred twenty".