1230989 has 4 divisors (see below), whose sum is σ = 1235040. Its totient is φ = 1226940.

The previous prime is 1230967. The next prime is 1230997. The reversal of 1230989 is 9890321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9890321 = 7 ⋅1412903.

It is a cyclic number.

It is not a de Polignac number, because 1230989 - 2¹⁶ = 1165453 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1230949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1529 + ... + 2190.

It is an arithmetic number, because the mean of its divisors is an integer number (308760).

2^1230989 is an apocalyptic number.

It is an amenable number.

1230989 is a deficient number, since it is larger than the sum of its proper divisors (4051).

1230989 is an equidigital number, since it uses as much as digits as its factorization.

1230989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4050.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 1230989 is about 1109.4994366830. The cubic root of 1230989 is about 107.1728362247.

The spelling of 1230989 in words is "one million, two hundred thirty thousand, nine hundred eighty-nine".