125742239 has 4 divisors (see below), whose sum is σ = 143705424. Its totient is φ = 107779056.

The previous prime is 125742233. The next prime is 125742241. The reversal of 125742239 is 932247521.

It is a happy number.

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

It is not a de Polignac number, because 125742239 - 2⁴ = 125742223 is a prime.

It is a super-2 number, since 2×125742239² = 31622221337466242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 125742199 and 125742208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125742233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8981582 + ... + 8981595.

It is an arithmetic number, because the mean of its divisors is an integer number (35926356).

Almost surely, 2^125742239 is an apocalyptic number.

125742239 is a deficient number, since it is larger than the sum of its proper divisors (17963185).

125742239 is an equidigital number, since it uses as much as digits as its factorization.

125742239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17963184.

The product of its digits is 30240, while the sum is 35.

The square root of 125742239 is about 11213.4846947771. The cubic root of 125742239 is about 500.9876996142.

The spelling of 125742239 in words is "one hundred twenty-five million, seven hundred forty-two thousand, two hundred thirty-nine".