126261905 has 16 divisors (see below), whose sum is σ = 188901504. Its totient is φ = 78708480.

The previous prime is 126261869. The next prime is 126261917. The reversal of 126261905 is 509162621.

It is a happy number.

It is not a de Polignac number, because 126261905 - 2²⁶ = 59153041 is a prime.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 163592 + ... + 164361.

It is an arithmetic number, because the mean of its divisors is an integer number (11806344).

Almost surely, 2^126261905 is an apocalyptic number.

It is an amenable number.

126261905 is a deficient number, since it is larger than the sum of its proper divisors (62639599).

126261905 is a wasteful number, since it uses less digits than its factorization.

126261905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327976.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 126261905 is about 11236.6322801807. The cubic root of 126261905 is about 501.6769096606.

The spelling of 126261905 in words is "one hundred twenty-six million, two hundred sixty-one thousand, nine hundred five".