1989545 has 8 divisors (see below), whose sum is σ = 2469960. Its totient is φ = 1536640.

The previous prime is 1989517. The next prime is 1989551. The reversal of 1989545 is 5459891.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 63001 + 1926544 = 251^2 + 1388^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1989545 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 6716 + ... + 7005.

It is an arithmetic number, because the mean of its divisors is an integer number (308745).

2^1989545 is an apocalyptic number.

It is an amenable number.

1989545 is a deficient number, since it is larger than the sum of its proper divisors (480415).

1989545 is a wasteful number, since it uses less digits than its factorization.

1989545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13755.

The product of its digits is 64800, while the sum is 41.

The square root of 1989545 is about 1410.5123182730. The cubic root of 1989545 is about 125.7721800810.

The spelling of 1989545 in words is "one million, nine hundred eighty-nine thousand, five hundred forty-five".