1989547 has 12 divisors (see below), whose sum is σ = 2437320. Its totient is φ = 1614816.

The previous prime is 1989517. The next prime is 1989551. The reversal of 1989547 is 7459891.

It is not a de Polignac number, because 1989547 - 2⁷ = 1989419 is a prime.

1989547 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1989517) 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, 138 + ... + 1999.

It is an arithmetic number, because the mean of its divisors is an integer number (203110).

2^1989547 is an apocalyptic number.

1989547 is a deficient number, since it is larger than the sum of its proper divisors (447773).

1989547 is a wasteful number, since it uses less digits than its factorization.

1989547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2170 (or 2163 counting only the distinct ones).

The product of its digits is 90720, while the sum is 43.

The square root of 1989547 is about 1410.5130272351. The cubic root of 1989547 is about 125.7722222254.

The spelling of 1989547 in words is "one million, nine hundred eighty-nine thousand, five hundred forty-seven".