90018019 has 24 divisors (see below), whose sum is σ = 113840640. Its totient is φ = 69664608.

The previous prime is 90018013. The next prime is 90018023. The reversal of 90018019 is 91081009.

It is not a de Polignac number, because 90018019 - 2⁵ = 90017987 is a prime.

It is a super-2 number, since 2×90018019² = 16206487489368722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90018013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54792 + ... + 56410.

It is an arithmetic number, because the mean of its divisors is an integer number (4743360).

Almost surely, 2^90018019 is an apocalyptic number.

90018019 is a deficient number, since it is larger than the sum of its proper divisors (23822621).

90018019 is a wasteful number, since it uses less digits than its factorization.

90018019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1699 (or 1686 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 90018019 is about 9487.7826176615. The cubic root of 90018019 is about 448.1703802275.

It can be divided in two parts, 9001 and 8019, that added together give a triangular number (17020 = T₁₈₄).

The spelling of 90018019 in words is "ninety million, eighteen thousand, nineteen".