90384538 has 16 divisors (see below), whose sum is σ = 139281120. Its totient is φ = 43965936.

The previous prime is 90384533. The next prime is 90384559. The reversal of 90384538 is 83548309.

It is a self number, because there is not a number n which added to its sum of digits gives 90384538.

It is not an unprimeable number, because it can be changed into a prime (90384533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21181 + ... + 25087.

It is an arithmetic number, because the mean of its divisors is an integer number (8705070).

Almost surely, 2^90384538 is an apocalyptic number.

90384538 is a deficient number, since it is larger than the sum of its proper divisors (48896582).

90384538 is a wasteful number, since it uses less digits than its factorization.

90384538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4221.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 90384538 is about 9507.0783103959. The cubic root of 90384538 is about 448.7778161077. Note that the first 3 decimals are identical.

The spelling of 90384538 in words is "ninety million, three hundred eighty-four thousand, five hundred thirty-eight".