90021423 has 8 divisors (see below), whose sum is σ = 124167600. Its totient is φ = 57944768.

The previous prime is 90021391. The next prime is 90021439. The reversal of 90021423 is 32412009.

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

It is a cyclic number.

It is not a de Polignac number, because 90021423 - 2⁵ = 90021391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90021423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90021223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 517278 + ... + 517451.

It is an arithmetic number, because the mean of its divisors is an integer number (15520950).

Almost surely, 2^90021423 is an apocalyptic number.

90021423 is a deficient number, since it is larger than the sum of its proper divisors (34146177).

90021423 is a wasteful number, since it uses less digits than its factorization.

90021423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034761.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 90021423 is about 9487.9620045614. The cubic root of 90021423 is about 448.1760292918.

The spelling of 90021423 in words is "ninety million, twenty-one thousand, four hundred twenty-three".