125839821 has 8 divisors (see below), whose sum is σ = 171356544. Its totient is φ = 82108160.

The previous prime is 125839817. The next prime is 125839823. The reversal of 125839821 is 128938521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 125839821 - 2² = 125839817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 125839821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125839823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 446100 + ... + 446381.

It is an arithmetic number, because the mean of its divisors is an integer number (21419568).

Almost surely, 2^125839821 is an apocalyptic number.

It is an amenable number.

125839821 is a deficient number, since it is larger than the sum of its proper divisors (45516723).

125839821 is an equidigital number, since it uses as much as digits as its factorization.

125839821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892531.

The product of its digits is 34560, while the sum is 39.

The square root of 125839821 is about 11217.8349515403. The cubic root of 125839821 is about 501.1172629209.

The spelling of 125839821 in words is "one hundred twenty-five million, eight hundred thirty-nine thousand, eight hundred twenty-one".