408869 has 2 divisors, whose sum is σ = 408870. Its totient is φ = 408868.

The previous prime is 408857. The next prime is 408911. The reversal of 408869 is 968804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 315844 + 93025 = 562^2 + 305^2 .

It is a cyclic number.

It is not a de Polignac number, because 408869 - 2¹² = 404773 is a prime.

It is a super-2 number, since 2×408869² = 334347718322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (408809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204434 + 204435.

It is an arithmetic number, because the mean of its divisors is an integer number (204435).

2⁴⁰⁸⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

408869 is a deficient number, since it is larger than the sum of its proper divisors (1).

408869 is an equidigital number, since it uses as much as digits as its factorization.

408869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 408869 is about 639.4286512192. The cubic root of 408869 is about 74.2212153235.

The spelling of 408869 in words is "four hundred eight thousand, eight hundred sixty-nine".