125781236 has 36 divisors (see below), whose sum is σ = 264896100. Its totient is φ = 52045056.

The previous prime is 125781233. The next prime is 125781281. The reversal of 125781236 is 632187521.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 98803600 + 26977636 = 9940^2 + 5194^2 .

It is a junction number, because it is equal to n+sod(n) for n = 125781196 and 125781205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125781233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5381 + ... + 16748.

It is an arithmetic number, because the mean of its divisors is an integer number (7358225).

Almost surely, 2^125781236 is an apocalyptic number.

It is an amenable number.

125781236 is an abundant number, since it is smaller than the sum of its proper divisors (139114864).

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

125781236 is a wasteful number, since it uses less digits than its factorization.

125781236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22176 (or 22167 counting only the distinct ones).

The product of its digits is 20160, while the sum is 35.

The square root of 125781236 is about 11215.2234039274. The cubic root of 125781236 is about 501.0394854424.

The spelling of 125781236 in words is "one hundred twenty-five million, seven hundred eighty-one thousand, two hundred thirty-six".