1990830 has 16 divisors (see below), whose sum is σ = 4778064. Its totient is φ = 530880.

The previous prime is 1990829. The next prime is 1990831. The reversal of 1990830 is 380991.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1990829) and next prime (1990831).

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 66361 = 1990830 / (1 + 9 + 9 + 0 + 8 + 3 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990831) by changing a digit.

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, 33151 + ... + 33210.

It is an arithmetic number, because the mean of its divisors is an integer number (298629).

2^1990830 is an apocalyptic number.

1990830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1990830 is an abundant number, since it is smaller than the sum of its proper divisors (2787234).

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

1990830 is a wasteful number, since it uses less digits than its factorization.

1990830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66371.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 1990830 is about 1410.9677529979. The cubic root of 1990830 is about 125.7992520111.

The spelling of 1990830 in words is "one million, nine hundred ninety thousand, eight hundred thirty".