126808509 has 16 divisors (see below), whose sum is σ = 175857920. Its totient is φ = 81207360.

The previous prime is 126808501. The next prime is 126808511. The reversal of 126808509 is 905808621.

It is not a de Polignac number, because 126808509 - 2³ = 126808501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126808501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1539 + ... + 15999.

It is an arithmetic number, because the mean of its divisors is an integer number (10991120).

Almost surely, 2^126808509 is an apocalyptic number.

It is an amenable number.

126808509 is a deficient number, since it is larger than the sum of its proper divisors (49049411).

126808509 is a wasteful number, since it uses less digits than its factorization.

126808509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14580.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 126808509 is about 11260.9284253120. The cubic root of 126808509 is about 502.3998087417.

The spelling of 126808509 in words is "one hundred twenty-six million, eight hundred eight thousand, five hundred nine".