1980290 has 16 divisors (see below), whose sum is σ = 3838968. Its totient is φ = 731136.

The previous prime is 1980289. The next prime is 1980301. The reversal of 1980290 is 920891.

It can be written as a sum of positive squares in 4 ways, for example, as 863041 + 1117249 = 929^2 + 1057^2 .

It is a Curzon number.

It is an unprimeable number.

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, 7487 + ... + 7746.

2^1980290 is an apocalyptic number.

1980290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1980290 is a deficient number, since it is larger than the sum of its proper divisors (1858678).

1980290 is a wasteful number, since it uses less digits than its factorization.

1980290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15253.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 1980290 is about 1407.2277711870. The cubic root of 1980290 is about 125.5768538223.

The spelling of 1980290 in words is "one million, nine hundred eighty thousand, two hundred ninety".