1212889 has 2 divisors, whose sum is σ = 1212890. Its totient is φ = 1212888.

The previous prime is 1212877. The next prime is 1212907. The reversal of 1212889 is 9882121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1172889 + 40000 = 1083^2 + 200^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212889 - 2⁵ = 1212857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212889.

It is not a weakly prime, because it can be changed into another prime (1212839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606444 + 606445.

It is an arithmetic number, because the mean of its divisors is an integer number (606445).

2^1212889 is an apocalyptic number.

It is an amenable number.

1212889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212889 is an equidigital number, since it uses as much as digits as its factorization.

1212889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 31.

The square root of 1212889 is about 1101.3123989132. The cubic root of 1212889 is about 106.6449641177.

The spelling of 1212889 in words is "one million, two hundred twelve thousand, eight hundred eighty-nine".