1989243 has 12 divisors (see below), whose sum is σ = 3024840. Its totient is φ = 1256256.

The previous prime is 1989241. The next prime is 1989259. The reversal of 1989243 is 3429891.

It is not a de Polignac number, because 1989243 - 2¹ = 1989241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1989198 and 1989207.

It is not an unprimeable number, because it can be changed into a prime (1989241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5646 + ... + 5987.

It is an arithmetic number, because the mean of its divisors is an integer number (252070).

2^1989243 is an apocalyptic number.

1989243 is a deficient number, since it is larger than the sum of its proper divisors (1035597).

1989243 is a wasteful number, since it uses less digits than its factorization.

1989243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11658 (or 11655 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 1989243 is about 1410.4052609091. The cubic root of 1989243 is about 125.7658159592.

The spelling of 1989243 in words is "one million, nine hundred eighty-nine thousand, two hundred forty-three".