1206402889 has 2 divisors, whose sum is σ = 1206402890. Its totient is φ = 1206402888.

The previous prime is 1206402887. The next prime is 1206402931. The reversal of 1206402889 is 9882046021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 966152889 + 240250000 = 31083^2 + 15500^2 .

It is a cyclic number.

It is not a de Polignac number, because 1206402889 - 2¹ = 1206402887 is a prime.

Together with 1206402887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1206402881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 603201444 + 603201445.

It is an arithmetic number, because the mean of its divisors is an integer number (603201445).

Almost surely, 2^1206402889 is an apocalyptic number.

It is an amenable number.

1206402889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1206402889 is an equidigital number, since it uses as much as digits as its factorization.

1206402889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 1206402889 is about 34733.3109420913. The cubic root of 1206402889 is about 1064.5452411265.

The spelling of 1206402889 in words is "one billion, two hundred six million, four hundred two thousand, eight hundred eighty-nine".