690423 has 8 divisors (see below), whose sum is σ = 924528. Its totient is φ = 458304.

The previous prime is 690419. The next prime is 690427. The reversal of 690423 is 324096.

It is an interprime number because it is at equal distance from previous prime (690419) and next prime (690427).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 690423 - 2² = 690419 is a prime.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 690393 and 690402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690427) 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 7 ways as a sum of consecutive naturals, for example, 811 + ... + 1427.

It is an arithmetic number, because the mean of its divisors is an integer number (115566).

2⁶⁹⁰⁴²³ is an apocalyptic number.

690423 is a deficient number, since it is larger than the sum of its proper divisors (234105).

690423 is a wasteful number, since it uses less digits than its factorization.

690423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993.

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

The square root of 690423 is about 830.9169633604. The cubic root of 690423 is about 88.3836128452.

The spelling of 690423 in words is "six hundred ninety thousand, four hundred twenty-three".