126449509 has 8 divisors (see below), whose sum is σ = 129677760. Its totient is φ = 123261600.

The previous prime is 126449489. The next prime is 126449513. The reversal of 126449509 is 905944621.

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

It is a cyclic number.

It is not a de Polignac number, because 126449509 - 2⁷ = 126449381 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 (126449539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3687 + ... + 16324.

It is an arithmetic number, because the mean of its divisors is an integer number (16209720).

Almost surely, 2^126449509 is an apocalyptic number.

It is an amenable number.

126449509 is a deficient number, since it is larger than the sum of its proper divisors (3228251).

126449509 is an equidigital number, since it uses as much as digits as its factorization.

126449509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20171.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 126449509 is about 11244.9770564461. The cubic root of 126449509 is about 501.9252559310.

The spelling of 126449509 in words is "one hundred twenty-six million, four hundred forty-nine thousand, five hundred nine".