690923 has 4 divisors (see below), whose sum is σ = 693048. Its totient is φ = 688800.

The previous prime is 690919. The next prime is 690929. The reversal of 690923 is 329096.

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 690923 - 2² = 690919 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 461 + ... + 1262.

It is an arithmetic number, because the mean of its divisors is an integer number (173262).

2⁶⁹⁰⁹²³ is an apocalyptic number.

690923 is a deficient number, since it is larger than the sum of its proper divisors (2125).

690923 is a wasteful number, since it uses less digits than its factorization.

690923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2124.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 690923 is about 831.2177813305. The cubic root of 690923 is about 88.4049433160.

The spelling of 690923 in words is "six hundred ninety thousand, nine hundred twenty-three".