125768639 has 4 divisors (see below), whose sum is σ = 125809320. Its totient is φ = 125727960.

The previous prime is 125768633. The next prime is 125768647. The reversal of 125768639 is 936867521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936867521 = 1879 ⋅498599.

It is a cyclic number.

It is not a de Polignac number, because 125768639 - 2¹² = 125764543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 125768593 and 125768602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125768633) 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, 15284 + ... + 22025.

It is an arithmetic number, because the mean of its divisors is an integer number (31452330).

Almost surely, 2^125768639 is an apocalyptic number.

125768639 is a deficient number, since it is larger than the sum of its proper divisors (40681).

125768639 is an equidigital number, since it uses as much as digits as its factorization.

125768639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40680.

The product of its digits is 544320, while the sum is 47.

The square root of 125768639 is about 11214.6617871428. The cubic root of 125768639 is about 501.0227585036.

It can be divided in two parts, 1257 and 68639, that added together give a palindrome (69896).

The spelling of 125768639 in words is "one hundred twenty-five million, seven hundred sixty-eight thousand, six hundred thirty-nine".