125991938 has 6 divisors (see below), whose sum is σ = 189011721. Its totient is φ = 62988032.

The previous prime is 125991923. The next prime is 125991961. The reversal of 125991938 is 839199521.

It can be written as a sum of positive squares in 2 ways, for example, as 74252689 + 51739249 = 8617^2 + 7193^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=7937.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 125991892 and 125991901.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 11906 + ... + 19842.

Almost surely, 2^125991938 is an apocalyptic number.

125991938 is a deficient number, since it is larger than the sum of its proper divisors (63019783).

125991938 is an frugal number, since it uses more digits than its factorization.

125991938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15876 (or 7939 counting only the distinct ones).

The product of its digits is 174960, while the sum is 47.

The square root of 125991938 is about 11224.6130445553. The cubic root of 125991938 is about 501.3191008853.

The spelling of 125991938 in words is "one hundred twenty-five million, nine hundred ninety-one thousand, nine hundred thirty-eight".