1989247 has 8 divisors (see below), whose sum is σ = 2235744. Its totient is φ = 1756128.

The previous prime is 1989241. The next prime is 1989259. The reversal of 1989247 is 7429891.

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

It is a cyclic number.

It is not a de Polignac number, because 1989247 - 2¹⁹ = 1464959 is a prime.

It is a Duffinian number.

1989247 is a lucky number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 3028 + ... + 3625.

It is an arithmetic number, because the mean of its divisors is an integer number (279468).

2^1989247 is an apocalyptic number.

1989247 is a deficient number, since it is larger than the sum of its proper divisors (246497).

1989247 is a wasteful number, since it uses less digits than its factorization.

1989247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6689.

The product of its digits is 36288, while the sum is 40.

The square root of 1989247 is about 1410.4066789405. The cubic root of 1989247 is about 125.7659002564.

The spelling of 1989247 in words is "one million, nine hundred eighty-nine thousand, two hundred forty-seven".