690243 has 4 divisors (see below), whose sum is σ = 920328. Its totient is φ = 460160.

The previous prime is 690233. The next prime is 690259. The reversal of 690243 is 342096.

690243 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 690243 - 2⁸ = 689987 is a prime.

It is a D-number.

690243 is strictly pandigital in base 7.

It is a nialpdrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 690243.

It is not an unprimeable number, because it can be changed into a prime (690233) 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 in 3 ways as a sum of consecutive naturals, for example, 115038 + ... + 115043.

It is an arithmetic number, because the mean of its divisors is an integer number (230082).

2⁶⁹⁰²⁴³ is an apocalyptic number.

690243 is a deficient number, since it is larger than the sum of its proper divisors (230085).

690243 is a wasteful number, since it uses less digits than its factorization.

690243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230084.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 690243 is about 830.8086422276. The cubic root of 690243 is about 88.3759313548.

The spelling of 690243 in words is "six hundred ninety thousand, two hundred forty-three".