1889985 has 16 divisors (see below), whose sum is σ = 3046464. Its totient is φ = 1000512.

The previous prime is 1889981. The next prime is 1889999. The reversal of 1889985 is 5899881.

It is not a de Polignac number, because 1889985 - 2² = 1889981 is a prime.

It is an Ulam number.

1889985 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1889981) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2059 + ... + 2831.

It is an arithmetic number, because the mean of its divisors is an integer number (190404).

2^1889985 is an apocalyptic number.

1889985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1889985 is a deficient number, since it is larger than the sum of its proper divisors (1156479).

1889985 is a wasteful number, since it uses less digits than its factorization.

1889985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944.

The product of its digits is 207360, while the sum is 48.

The square root of 1889985 is about 1374.7672530287. The cubic root of 1889985 is about 123.6382319073.

The spelling of 1889985 in words is "one million, eight hundred eighty-nine thousand, nine hundred eighty-five".