867407921 has 2 divisors, whose sum is σ = 867407922. Its totient is φ = 867407920.

The previous prime is 867407917. The next prime is 867407963. The reversal of 867407921 is 129704768.

867407921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 765296896 + 102111025 = 27664^2 + 10105^2 .

It is a cyclic number.

It is not a de Polignac number, because 867407921 - 2² = 867407917 is a prime.

It is not a weakly prime, because it can be changed into another prime (867400921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433703960 + 433703961.

It is an arithmetic number, because the mean of its divisors is an integer number (433703961).

Almost surely, 2^867407921 is an apocalyptic number.

It is an amenable number.

867407921 is a deficient number, since it is larger than the sum of its proper divisors (1).

867407921 is an equidigital number, since it uses as much as digits as its factorization.

867407921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 867407921 is about 29451.7897758354. The cubic root of 867407921 is about 953.6912423586.

The spelling of 867407921 in words is "eight hundred sixty-seven million, four hundred seven thousand, nine hundred twenty-one".