1021880 has 32 divisors (see below), whose sum is σ = 2343600. Its totient is φ = 400896.

The previous prime is 1021879. The next prime is 1021897. The reversal of 1021880 is 881201.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

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, 2144 + ... + 2576.

2^1021880 is an apocalyptic number.

1021880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1171800).

1021880 is an abundant number, since it is smaller than the sum of its proper divisors (1321720).

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

1021880 is a wasteful number, since it uses less digits than its factorization.

1021880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503 (or 499 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 1021880 is about 1010.8808040516. The cubic root of 1021880 is about 100.7240777926.

The spelling of 1021880 in words is "one million, twenty-one thousand, eight hundred eighty".