1020890 has 16 divisors (see below), whose sum is σ = 1979208. Its totient is φ = 376896.

The previous prime is 1020881. The next prime is 1020893. The reversal of 1020890 is 980201.

It can be written as a sum of positive squares in 4 ways, for example, as 316969 + 703921 = 563^2 + 839^2 .

It is not an unprimeable number, because it can be changed into a prime (1020893) 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, 3797 + ... + 4056.

2^1020890 is an apocalyptic number.

1020890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1020890 is a deficient number, since it is larger than the sum of its proper divisors (958318).

1020890 is a wasteful number, since it uses less digits than its factorization.

1020890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7873.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1020890 is about 1010.3910134201. The cubic root of 1020890 is about 100.6915400334.

The spelling of 1020890 in words is "one million, twenty thousand, eight hundred ninety".