1889865 has 16 divisors (see below), whose sum is σ = 3360000. Its totient is φ = 1007856.

The previous prime is 1889831. The next prime is 1889957. The reversal of 1889865 is 5689881.

It is not a de Polignac number, because 1889865 - 2⁶ = 1889801 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an Ulam number.

1889865 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1889865.

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 15 ways as a sum of consecutive naturals, for example, 6865 + ... + 7134.

It is an arithmetic number, because the mean of its divisors is an integer number (210000).

2^1889865 is an apocalyptic number.

1889865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1889865 is a deficient number, since it is larger than the sum of its proper divisors (1470135).

1889865 is a wasteful number, since it uses less digits than its factorization.

1889865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14013 (or 14007 counting only the distinct ones).

The product of its digits is 138240, while the sum is 45.

The square root of 1889865 is about 1374.7236085846. The cubic root of 1889865 is about 123.6356151489.

The spelling of 1889865 in words is "one million, eight hundred eighty-nine thousand, eight hundred sixty-five".