90018396 has 36 divisors (see below), whose sum is σ = 245051352. Its totient is φ = 27697824.

The previous prime is 90018391. The next prime is 90018403. The reversal of 90018396 is 69381009.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 90018396.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90018391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 95706 + ... + 96641.

It is an arithmetic number, because the mean of its divisors is an integer number (6806982).

Almost surely, 2^90018396 is an apocalyptic number.

It is an amenable number.

90018396 is an abundant number, since it is smaller than the sum of its proper divisors (155032956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90018396 is a wasteful number, since it uses less digits than its factorization.

90018396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192370 (or 192365 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 90018396 is about 9487.8024852966. The cubic root of 90018396 is about 448.1710058800.

The spelling of 90018396 in words is "ninety million, eighteen thousand, three hundred ninety-six".