90439423 has 2 divisors, whose sum is σ = 90439424. Its totient is φ = 90439422.

The previous prime is 90439417. The next prime is 90439451. The reversal of 90439423 is 32493409.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90439423 - 2⁹ = 90438911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90439463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45219711 + 45219712.

It is an arithmetic number, because the mean of its divisors is an integer number (45219712).

Almost surely, 2^90439423 is an apocalyptic number.

90439423 is a deficient number, since it is larger than the sum of its proper divisors (1).

90439423 is an equidigital number, since it uses as much as digits as its factorization.

90439423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 90439423 is about 9509.9644058219. The cubic root of 90439423 is about 448.8686361639.

The spelling of 90439423 in words is "ninety million, four hundred thirty-nine thousand, four hundred twenty-three".