1990128 has 40 divisors (see below), whose sum is σ = 5876608. Its totient is φ = 568512.

The previous prime is 1990123. The next prime is 1990133. The reversal of 1990128 is 8210991.

It is an interprime number because it is at equal distance from previous prime (1990123) and next prime (1990133).

It is a junction number, because it is equal to n+sod(n) for n = 1990095 and 1990104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990123) 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, 2626 + ... + 3297.

2^1990128 is an apocalyptic number.

It is an amenable number.

1990128 is an abundant number, since it is smaller than the sum of its proper divisors (3886480).

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

1990128 is a wasteful number, since it uses less digits than its factorization.

1990128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5941 (or 5935 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 1990128 is about 1410.7189656342. The cubic root of 1990128 is about 125.7844639650.

The spelling of 1990128 in words is "one million, nine hundred ninety thousand, one hundred twenty-eight".