90423 has 16 divisors (see below), whose sum is σ = 142560. Its totient is φ = 56448.

The previous prime is 90407. The next prime is 90437. The reversal of 90423 is 32409.

It is not a de Polignac number, because 90423 - 2⁴ = 90407 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 90396 and 90405.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 90423.

It is not an unprimeable number, because it can be changed into a prime (90403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 361 + ... + 557.

It is an arithmetic number, because the mean of its divisors is an integer number (8910).

2⁹⁰⁴²³ is an apocalyptic number.

90423 is a deficient number, since it is larger than the sum of its proper divisors (52137).

90423 is a wasteful number, since it uses less digits than its factorization.

90423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 90423 is about 300.7041735660. The cubic root of 90423 is about 44.8841464327.

It can be divided in two parts, 9042 and 3, that added together give a triangular number (9045 = T₁₃₄).

The spelling of 90423 in words is "ninety thousand, four hundred twenty-three".