126639 has 6 divisors (see below), whose sum is σ = 182936. Its totient is φ = 84420.

The previous prime is 126631. The next prime is 126641. The reversal of 126639 is 936621.

It is a happy number.

126639 is a `hidden beast` number, since 1 + 26 + 639 = 666.

It is not a de Polignac number, because 126639 - 2³ = 126631 is a prime.

It is a Duffinian number.

126639 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7027 + ... + 7044.

2¹²⁶⁶³⁹ is an apocalyptic number.

126639 is a deficient number, since it is larger than the sum of its proper divisors (56297).

126639 is a wasteful number, since it uses less digits than its factorization.

126639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14077 (or 14074 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 126639 is about 355.8637379672. The cubic root of 126639 is about 50.2175850944.

The spelling of 126639 in words is "one hundred twenty-six thousand, six hundred thirty-nine".