1229889 has 8 divisors (see below), whose sum is σ = 1726240. Its totient is φ = 776736.

The previous prime is 1229873. The next prime is 1229897. The reversal of 1229889 is 9889221.

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

It is not a de Polignac number, because 1229889 - 2⁴ = 1229873 is a prime.

It is an Ulam number.

It is a Duffinian number.

1229889 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1229869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10732 + ... + 10845.

It is an arithmetic number, because the mean of its divisors is an integer number (215780).

2^1229889 is an apocalyptic number.

1229889 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1229889 is a deficient number, since it is larger than the sum of its proper divisors (496351).

1229889 is a wasteful number, since it uses less digits than its factorization.

1229889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21599.

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

The square root of 1229889 is about 1109.0036068472. The cubic root of 1229889 is about 107.1409038374.

It can be divided in two parts, 122 and 9889, that added together give a triangular number (10011 = T₁₄₁).

The spelling of 1229889 in words is "one million, two hundred twenty-nine thousand, eight hundred eighty-nine".