1881020 has 24 divisors (see below), whose sum is σ = 3981264. Its totient is φ = 746496.

The previous prime is 1880993. The next prime is 1881031. The reversal of 1881020 is 201881.

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

It is a junction number, because it is equal to n+sod(n) for n = 1880983 and 1881001.

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, 2972 + ... + 3548.

It is an arithmetic number, because the mean of its divisors is an integer number (165886).

2^1881020 is an apocalyptic number.

1881020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1881020 is an abundant number, since it is smaller than the sum of its proper divisors (2100244).

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

1881020 is a wasteful number, since it uses less digits than its factorization.

1881020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749 (or 747 counting only the distinct ones).

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

The square root of 1881020 is about 1371.5028253708. The cubic root of 1881020 is about 123.4424324793.

The spelling of 1881020 in words is "one million, eight hundred eighty-one thousand, twenty".