1989790 has 16 divisors (see below), whose sum is σ = 3907440. Its totient is φ = 723520.

The previous prime is 1989787. The next prime is 1989791. The reversal of 1989790 is 979891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989791) 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, 8935 + ... + 9154.

It is an arithmetic number, because the mean of its divisors is an integer number (244215).

2^1989790 is an apocalyptic number.

1989790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1989790 is a deficient number, since it is larger than the sum of its proper divisors (1917650).

1989790 is a wasteful number, since it uses less digits than its factorization.

1989790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18107.

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 1989790 is about 1410.5991634763. The cubic root of 1989790 is about 125.7773425544. Note that the first 3 decimals are identical.

The spelling of 1989790 in words is "one million, nine hundred eighty-nine thousand, seven hundred ninety".