1820489 has 8 divisors (see below), whose sum is σ = 1995840. Its totient is φ = 1646800.

The previous prime is 1820471. The next prime is 1820501. The reversal of 1820489 is 9840281.

It is a happy number.

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 1820489 - 2¹⁶ = 1754953 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820419) 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, 3719 + ... + 4179.

It is an arithmetic number, because the mean of its divisors is an integer number (249480).

2^1820489 is an apocalyptic number.

It is an amenable number.

1820489 is a deficient number, since it is larger than the sum of its proper divisors (175351).

1820489 is a wasteful number, since it uses less digits than its factorization.

1820489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 1820489 is about 1349.2549796091. The cubic root of 1820489 is about 122.1038486906.

The spelling of 1820489 in words is "one million, eight hundred twenty thousand, four hundred eighty-nine".