125843638 has 4 divisors (see below), whose sum is σ = 188765460. Its totient is φ = 62921818.

The previous prime is 125843617. The next prime is 125843647. The reversal of 125843638 is 836348521.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 125843638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31460908 + ... + 31460911.

It is an arithmetic number, because the mean of its divisors is an integer number (47191365).

Almost surely, 2^125843638 is an apocalyptic number.

125843638 is a deficient number, since it is larger than the sum of its proper divisors (62921822).

125843638 is an equidigital number, since it uses as much as digits as its factorization.

125843638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62921821.

The product of its digits is 138240, while the sum is 40.

The square root of 125843638 is about 11218.0050811185. The cubic root of 125843638 is about 501.1223295345.

The spelling of 125843638 in words is "one hundred twenty-five million, eight hundred forty-three thousand, six hundred thirty-eight".