1990002 has 16 divisors (see below), whose sum is σ = 4548672. Its totient is φ = 568560.

The previous prime is 1989989. The next prime is 1990007. The reversal of 1990002 is 2000991.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1990007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23649 + ... + 23732.

It is an arithmetic number, because the mean of its divisors is an integer number (284292).

2^1990002 is an apocalyptic number.

1990002 is an abundant number, since it is smaller than the sum of its proper divisors (2558670).

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

1990002 is a wasteful number, since it uses less digits than its factorization.

1990002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47393.

The product of its (nonzero) digits is 162, while the sum is 21.

The square root of 1990002 is about 1410.6743068476. The cubic root of 1990002 is about 125.7818093323.

Adding to 1990002 its reverse (2000991), we get a palindrome (3990993).

The spelling of 1990002 in words is "one million, nine hundred ninety thousand, two".