18490038 has 16 divisors (see below), whose sum is σ = 42263040. Its totient is φ = 5282856.

The previous prime is 18490019. The next prime is 18490049. The reversal of 18490038 is 83009481.

It is a junction number, because it is equal to n+sod(n) for n = 18489990 and 18490008.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220078 + ... + 220161.

It is an arithmetic number, because the mean of its divisors is an integer number (2641440).

Almost surely, 2^18490038 is an apocalyptic number.

18490038 is an abundant number, since it is smaller than the sum of its proper divisors (23773002).

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

18490038 is a wasteful number, since it uses less digits than its factorization.

18490038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440251.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 18490038 is about 4300.0044186024. The cubic root of 18490038 is about 264.4311423894.

The spelling of 18490038 in words is "eighteen million, four hundred ninety thousand, thirty-eight".