126817305 has 32 divisors (see below), whose sum is σ = 218816640. Its totient is φ = 62507520.

The previous prime is 126817303. The next prime is 126817309. The reversal of 126817305 is 503718621.

It is not a de Polignac number, because 126817305 - 2¹ = 126817303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (126817303) 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 31 ways as a sum of consecutive naturals, for example, 6259 + ... + 17111.

It is an arithmetic number, because the mean of its divisors is an integer number (6838020).

Almost surely, 2^126817305 is an apocalyptic number.

126817305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

126817305 is a deficient number, since it is larger than the sum of its proper divisors (91999335).

126817305 is a wasteful number, since it uses less digits than its factorization.

126817305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10921.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 126817305 is about 11261.3189724828. The cubic root of 126817305 is about 502.4114246987.

The spelling of 126817305 in words is "one hundred twenty-six million, eight hundred seventeen thousand, three hundred five".