1055820 has 24 divisors (see below), whose sum is σ = 2956464. Its totient is φ = 281536.

The previous prime is 1055809. The next prime is 1055827. The reversal of 1055820 is 285501.

It is a super-2 number, since 2×1055820² = 2229511744800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1055827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8739 + ... + 8858.

It is an arithmetic number, because the mean of its divisors is an integer number (123186).

2^1055820 is an apocalyptic number.

1055820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1055820 is an abundant number, since it is smaller than the sum of its proper divisors (1900644).

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

1055820 is a wasteful number, since it uses less digits than its factorization.

1055820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17609 (or 17607 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 1055820 is about 1027.5310214295. The cubic root of 1055820 is about 101.8270811060.

The spelling of 1055820 in words is "one million, fifty-five thousand, eight hundred twenty".