125640843 has 4 divisors (see below), whose sum is σ = 167521128. Its totient is φ = 83760560.

The previous prime is 125640841. The next prime is 125640857. The reversal of 125640843 is 348046521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 348046521 = 3 ⋅116015507.

It is a cyclic number.

It is not a de Polignac number, because 125640843 - 2¹ = 125640841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (125640841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20940138 + ... + 20940143.

It is an arithmetic number, because the mean of its divisors is an integer number (41880282).

Almost surely, 2^125640843 is an apocalyptic number.

125640843 is a deficient number, since it is larger than the sum of its proper divisors (41880285).

125640843 is an equidigital number, since it uses as much as digits as its factorization.

125640843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41880284.

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 125640843 is about 11208.9626192614. The cubic root of 125640843 is about 500.8530012834.

The spelling of 125640843 in words is "one hundred twenty-five million, six hundred forty thousand, eight hundred forty-three".