1021090 has 32 divisors (see below), whose sum is σ = 2177280. Its totient is φ = 337344.

The previous prime is 1021087. The next prime is 1021091. The reversal of 1021090 is 901201.

1021090 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 1021090.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1779 + ... + 2281.

It is an arithmetic number, because the mean of its divisors is an integer number (68040).

2^1021090 is an apocalyptic number.

1021090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1021090 is an abundant number, since it is smaller than the sum of its proper divisors (1156190).

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

1021090 is a wasteful number, since it uses less digits than its factorization.

1021090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1021090 is about 1010.4899801581. The cubic root of 1021090 is about 100.6981150131.

Adding to 1021090 its reverse (901201), we get a palindrome (1922291).

The spelling of 1021090 in words is "one million, twenty-one thousand, ninety".