126390017 has 4 divisors (see below), whose sum is σ = 136112340. Its totient is φ = 116667696.

The previous prime is 126390013. The next prime is 126390023. The reversal of 126390017 is 710093621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12988816 + 113401201 = 3604^2 + 10649^2 .

It is a cyclic number.

It is not a de Polignac number, because 126390017 - 2² = 126390013 is a prime.

It is not an unprimeable number, because it can be changed into a prime (126390013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4861142 + ... + 4861167.

It is an arithmetic number, because the mean of its divisors is an integer number (34028085).

Almost surely, 2^126390017 is an apocalyptic number.

It is an amenable number.

126390017 is a deficient number, since it is larger than the sum of its proper divisors (9722323).

126390017 is an equidigital number, since it uses as much as digits as its factorization.

126390017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9722322.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 126390017 is about 11242.3314752768. The cubic root of 126390017 is about 501.8465282720.

The spelling of 126390017 in words is "one hundred twenty-six million, three hundred ninety thousand, seventeen".