90834021 has 8 divisors (see below), whose sum is σ = 134568960. Its totient is φ = 60555996.

The previous prime is 90834019. The next prime is 90834031. The reversal of 90834021 is 12043809.

It is not a de Polignac number, because 90834021 - 2¹ = 90834019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 3364223 = 90834021 / (9 + 0 + 8 + 3 + 4 + 0 + 2 + 1).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90834011) 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, 1682085 + ... + 1682138.

It is an arithmetic number, because the mean of its divisors is an integer number (16821120).

Almost surely, 2^90834021 is an apocalyptic number.

It is an amenable number.

90834021 is a deficient number, since it is larger than the sum of its proper divisors (43734939).

90834021 is a wasteful number, since it uses less digits than its factorization.

90834021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3364232 (or 3364226 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 90834021 is about 9530.6883801749. The cubic root of 90834021 is about 449.5205114943.

The spelling of 90834021 in words is "ninety million, eight hundred thirty-four thousand, twenty-one".