1990518 has 8 divisors (see below), whose sum is σ = 3981048. Its totient is φ = 663504.

The previous prime is 1990507. The next prime is 1990523. The reversal of 1990518 is 8150991.

It is a sphenic number, since it is the product of 3 distinct primes.

1990518 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165871 + ... + 165882.

It is an arithmetic number, because the mean of its divisors is an integer number (497631).

2^1990518 is an apocalyptic number.

1990518 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1990518 is a wasteful number, since it uses less digits than its factorization.

1990518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331758.

The product of its (nonzero) digits is 3240, while the sum is 33.

The square root of 1990518 is about 1410.8571862524. The cubic root of 1990518 is about 125.7926799754.

The spelling of 1990518 in words is "one million, nine hundred ninety thousand, five hundred eighteen".