921872339 has 2 divisors, whose sum is σ = 921872340. Its totient is φ = 921872338.

The previous prime is 921872317. The next prime is 921872401. The reversal of 921872339 is 933278129.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 921872339 - 2¹⁶ = 921806803 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 921872339.

It is not a weakly prime, because it can be changed into another prime (921877339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460936169 + 460936170.

It is an arithmetic number, because the mean of its divisors is an integer number (460936170).

Almost surely, 2^921872339 is an apocalyptic number.

921872339 is a deficient number, since it is larger than the sum of its proper divisors (1).

921872339 is an equidigital number, since it uses as much as digits as its factorization.

921872339 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 44.

The square root of 921872339 is about 30362.3506830417. The cubic root of 921872339 is about 973.2481675368.

The spelling of 921872339 in words is "nine hundred twenty-one million, eight hundred seventy-two thousand, three hundred thirty-nine".