1889145 has 12 divisors (see below), whose sum is σ = 3274596. Its totient is φ = 1007520.

The previous prime is 1889143. The next prime is 1889177. The reversal of 1889145 is 5419881.

It can be written as a sum of positive squares in 2 ways, for example, as 278784 + 1610361 = 528^2 + 1269^2 .

It is not a de Polignac number, because 1889145 - 2¹ = 1889143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1889143) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 20946 + ... + 21035.

It is an arithmetic number, because the mean of its divisors is an integer number (272883).

2^1889145 is an apocalyptic number.

1889145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1889145 is a deficient number, since it is larger than the sum of its proper divisors (1385451).

1889145 is a wasteful number, since it uses less digits than its factorization.

1889145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41992 (or 41989 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 1889145 is about 1374.4617128171. The cubic root of 1889145 is about 123.6199122725.

The spelling of 1889145 in words is "one million, eight hundred eighty-nine thousand, one hundred forty-five".