125643240 has 96 divisors (see below), whose sum is σ = 409804200. Its totient is φ = 33384960.

The previous prime is 125643223. The next prime is 125643269. The reversal of 125643240 is 42346521.

125643240 is a `hidden beast` number, since 12 + 5 + 643 + 2 + 4 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 63011844 + 62631396 = 7938^2 + 7914^2 .

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, 151146 + ... + 151974.

Almost surely, 2^125643240 is an apocalyptic number.

125643240 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 125643240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204902100).

125643240 is an abundant number, since it is smaller than the sum of its proper divisors (284160960).

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

125643240 is a wasteful number, since it uses less digits than its factorization.

125643240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267 (or 1260 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 125643240 is about 11209.0695421163. The cubic root of 125643240 is about 500.8561863862.

Adding to 125643240 its reverse (42346521), we get a palindrome (167989761).

The spelling of 125643240 in words is "one hundred twenty-five million, six hundred forty-three thousand, two hundred forty".