1228989 has 8 divisors (see below), whose sum is σ = 1650112. Its totient is φ = 813600.

The previous prime is 1228987. The next prime is 1228993. The reversal of 1228989 is 9898221.

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

It is not a de Polignac number, because 1228989 - 2¹ = 1228987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228987) 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, 904 + ... + 1809.

It is an arithmetic number, because the mean of its divisors is an integer number (206264).

2^1228989 is an apocalyptic number.

It is an amenable number.

1228989 is a deficient number, since it is larger than the sum of its proper divisors (421123).

1228989 is a wasteful number, since it uses less digits than its factorization.

1228989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2867.

The product of its digits is 20736, while the sum is 39.

The square root of 1228989 is about 1108.5977629420. The cubic root of 1228989 is about 107.1147631738.

The spelling of 1228989 in words is "one million, two hundred twenty-eight thousand, nine hundred eighty-nine".