127805905 has 8 divisors (see below), whose sum is σ = 154886184. Its totient is φ = 101232000.

The previous prime is 127805851. The next prime is 127805911. The reversal of 127805905 is 509508721.

It can be written as a sum of positive squares in 4 ways, for example, as 11532816 + 116273089 = 3396^2 + 10783^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 127805905 - 2¹⁹ = 127281617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126036 + ... + 127045.

It is an arithmetic number, because the mean of its divisors is an integer number (19360773).

Almost surely, 2^127805905 is an apocalyptic number.

It is an amenable number.

127805905 is a deficient number, since it is larger than the sum of its proper divisors (27080279).

127805905 is a wasteful number, since it uses less digits than its factorization.

127805905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253187.

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 127805905 is about 11305.1273765491. The cubic root of 127805905 is about 503.7135573676.

The spelling of 127805905 in words is "one hundred twenty-seven million, eight hundred five thousand, nine hundred five".