1889965 has 16 divisors (see below), whose sum is σ = 2828160. Its totient is φ = 1177920.

The previous prime is 1889957. The next prime is 1889969. The reversal of 1889965 is 5699881.

It is not a de Polignac number, because 1889965 - 2³ = 1889957 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1889969) 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 15 ways as a sum of consecutive naturals, for example, 2070 + ... + 2839.

It is an arithmetic number, because the mean of its divisors is an integer number (176760).

2^1889965 is an apocalyptic number.

It is an amenable number.

1889965 is a deficient number, since it is larger than the sum of its proper divisors (938195).

1889965 is a wasteful number, since it uses less digits than its factorization.

1889965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4932.

The product of its digits is 155520, while the sum is 46.

The square root of 1889965 is about 1374.7599790509. The cubic root of 1889965 is about 123.6377957886.

It can be divided in two parts, 188 and 9965, that added together give a triangular number (10153 = T₁₄₂).

The spelling of 1889965 in words is "one million, eight hundred eighty-nine thousand, nine hundred sixty-five".