126078321 has 16 divisors (see below), whose sum is σ = 174642048. Its totient is φ = 80841600.

The previous prime is 126078317. The next prime is 126078343. The reversal of 126078321 is 123870621.

It is not a de Polignac number, because 126078321 - 2² = 126078317 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (126078301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1515 + ... + 15951.

It is an arithmetic number, because the mean of its divisors is an integer number (10915128).

Almost surely, 2^126078321 is an apocalyptic number.

It is an amenable number.

126078321 is a deficient number, since it is larger than the sum of its proper divisors (48563727).

126078321 is a wasteful number, since it uses less digits than its factorization.

126078321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14552.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 126078321 is about 11228.4603129726. The cubic root of 126078321 is about 501.4336467187.

The spelling of 126078321 in words is "one hundred twenty-six million, seventy-eight thousand, three hundred twenty-one".