126639539 has 8 divisors (see below), whose sum is σ = 136486560. Its totient is φ = 116807616.

The previous prime is 126639533. The next prime is 126639553. The reversal of 126639539 is 935936621.

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 126639539 - 2²⁰ = 125590963 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 126639539.

It is not an unprimeable number, because it can be changed into a prime (126639533) 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, 18602 + ... + 24480.

It is an arithmetic number, because the mean of its divisors is an integer number (17060820).

Almost surely, 2^126639539 is an apocalyptic number.

126639539 is a deficient number, since it is larger than the sum of its proper divisors (9847021).

126639539 is a wasteful number, since it uses less digits than its factorization.

126639539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7549.

The product of its digits is 262440, while the sum is 44.

The square root of 126639539 is about 11253.4234346709. The cubic root of 126639539 is about 502.1765633952.

The spelling of 126639539 in words is "one hundred twenty-six million, six hundred thirty-nine thousand, five hundred thirty-nine".