867409 has 2 divisors, whose sum is σ = 867410. Its totient is φ = 867408.

The previous prime is 867401. The next prime is 867413. The reversal of 867409 is 904768.

867409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 540225 + 327184 = 735^2 + 572^2 .

It is a cyclic number.

It is not a de Polignac number, because 867409 - 2³ = 867401 is a prime.

It is not a weakly prime, because it can be changed into another prime (867401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433704 + 433705.

It is an arithmetic number, because the mean of its divisors is an integer number (433705).

2⁸⁶⁷⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

867409 is a deficient number, since it is larger than the sum of its proper divisors (1).

867409 is an equidigital number, since it uses as much as digits as its factorization.

867409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 867409 is about 931.3479478691. The cubic root of 867409 is about 95.3691637802.

The spelling of 867409 in words is "eight hundred sixty-seven thousand, four hundred nine".