126021605 has 8 divisors (see below), whose sum is σ = 154743072. Its totient is φ = 98472528.

The previous prime is 126021529. The next prime is 126021611. The reversal of 126021605 is 506120621.

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 126021605 - 2¹⁰ = 126020581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 292859 + ... + 293288.

It is an arithmetic number, because the mean of its divisors is an integer number (19342884).

Almost surely, 2^126021605 is an apocalyptic number.

It is an amenable number.

126021605 is a deficient number, since it is larger than the sum of its proper divisors (28721467).

126021605 is an equidigital number, since it uses as much as digits as its factorization.

126021605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586195.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 126021605 is about 11225.9344822603. The cubic root of 126021605 is about 501.3584459070.

The spelling of 126021605 in words is "one hundred twenty-six million, twenty-one thousand, six hundred five".