90019999 has 8 divisors (see below), whose sum is σ = 94049280. Its totient is φ = 86000376.

The previous prime is 90019997. The next prime is 90020003. The reversal of 90019999 is 99991009.

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 90019999 - 2¹ = 90019997 is a prime.

It is a Duffinian number.

90019999 is a modest number, since divided by 9999 gives 9001 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90019991) 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, 22014 + ... + 25780.

It is an arithmetic number, because the mean of its divisors is an integer number (11756160).

Almost surely, 2^90019999 is an apocalyptic number.

90019999 is a deficient number, since it is larger than the sum of its proper divisors (4029281).

90019999 is a wasteful number, since it uses less digits than its factorization.

90019999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4829.

The product of its (nonzero) digits is 59049, while the sum is 46.

The square root of 90019999 is about 9487.8869618056. The cubic root of 90019999 is about 448.1736661283.

The spelling of 90019999 in words is "ninety million, nineteen thousand, nine hundred ninety-nine".