90018729 has 16 divisors (see below), whose sum is σ = 134971200. Its totient is φ = 59287968.

The previous prime is 90018703. The next prime is 90018767. The reversal of 90018729 is 92781009.

It is a happy number.

It is not a de Polignac number, because 90018729 - 2¹¹ = 90016681 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90018693 and 90018702.

It is not an unprimeable number, because it can be changed into a prime (90018829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17844 + ... + 22325.

It is an arithmetic number, because the mean of its divisors is an integer number (8435700).

Almost surely, 2^90018729 is an apocalyptic number.

It is an amenable number.

90018729 is a deficient number, since it is larger than the sum of its proper divisors (44952471).

90018729 is a wasteful number, since it uses less digits than its factorization.

90018729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40261 (or 40255 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 90018729 is about 9487.8200341280. The cubic root of 90018729 is about 448.1715585106.

The spelling of 90018729 in words is "ninety million, eighteen thousand, seven hundred twenty-nine".