90021039 has 4 divisors (see below), whose sum is σ = 120028056. Its totient is φ = 60014024.

The previous prime is 90021013. The next prime is 90021047. The reversal of 90021039 is 93012009.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93012009 = 3 ⋅31004003.

It is a cyclic number.

It is not a de Polignac number, because 90021039 - 2⁵ = 90021007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90021049) 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 3 ways as a sum of consecutive naturals, for example, 15003504 + ... + 15003509.

It is an arithmetic number, because the mean of its divisors is an integer number (30007014).

Almost surely, 2^90021039 is an apocalyptic number.

90021039 is a deficient number, since it is larger than the sum of its proper divisors (30007017).

90021039 is a wasteful number, since it uses less digits than its factorization.

90021039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30007016.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 90021039 is about 9487.9417683711. The cubic root of 90021039 is about 448.1753920367.

The spelling of 90021039 in words is "ninety million, twenty-one thousand, thirty-nine".