1881000 has 192 divisors, whose sum is σ = 7300800. Its totient is φ = 432000.

The previous prime is 1880993. The next prime is 1881031. The reversal of 1881000 is 1881.

It is a happy number.

It is a super-2 number, since 2×1881000² = 7076322000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 98991 + ... + 99009.

It is an arithmetic number, because the mean of its divisors is an integer number (38025).

2^1881000 is an apocalyptic number.

1881000 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 1881000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3650400).

1881000 is an abundant number, since it is smaller than the sum of its proper divisors (5419800).

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

1881000 is a wasteful number, since it uses less digits than its factorization.

1881000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57 (or 40 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 1881000 is about 1371.4955340795. The cubic root of 1881000 is about 123.4419949760.

Adding to 1881000 its reverse (1881), we get a palindrome (1882881).

1881000 divided by its reverse (1881) gives a cube (1000 = 10³).

It can be divided in two parts, 18 and 81000, that added together give a palindrome (81018).

The spelling of 1881000 in words is "one million, eight hundred eighty-one thousand".