1971489 has 8 divisors (see below), whose sum is σ = 2830912. Its totient is φ = 1213200.

The previous prime is 1971481. The next prime is 1971503. The reversal of 1971489 is 9841791.

It is a happy number.

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

It is not a de Polignac number, because 1971489 - 2³ = 1971481 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 50551 = 1971489 / (1 + 9 + 7 + 1 + 4 + 8 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1971481) 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, 25237 + ... + 25314.

It is an arithmetic number, because the mean of its divisors is an integer number (353864).

2^1971489 is an apocalyptic number.

It is an amenable number.

1971489 is a deficient number, since it is larger than the sum of its proper divisors (859423).

1971489 is a wasteful number, since it uses less digits than its factorization.

1971489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50567.

The product of its digits is 18144, while the sum is 39.

The square root of 1971489 is about 1404.0972188563. The cubic root of 1971489 is about 125.3905438665.

The spelling of 1971489 in words is "one million, nine hundred seventy-one thousand, four hundred eighty-nine".