690449 has 2 divisors, whose sum is σ = 690450. Its totient is φ = 690448.

The previous prime is 690439. The next prime is 690467. The reversal of 690449 is 944096.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 555025 + 135424 = 745^2 + 368^2 .

It is a cyclic number.

It is not a de Polignac number, because 690449 - 2⁴ = 690433 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (690419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345224 + 345225.

It is an arithmetic number, because the mean of its divisors is an integer number (345225).

2⁶⁹⁰⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

690449 is a deficient number, since it is larger than the sum of its proper divisors (1).

690449 is an equidigital number, since it uses as much as digits as its factorization.

690449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 690449 is about 830.9326085791. The cubic root of 690449 is about 88.3847222835.

The spelling of 690449 in words is "six hundred ninety thousand, four hundred forty-nine".