1289192242 has 8 divisors (see below), whose sum is σ = 2082541356. Its totient is φ = 595011792.

The previous prime is 1289192209. The next prime is 1289192243. The reversal of 1289192242 is 2422919821.

It can be written as a sum of positive squares in 2 ways, for example, as 1056965121 + 232227121 = 32511^2 + 15239^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 1289192195 and 1289192204.

It is not an unprimeable number, because it can be changed into a prime (1289192243) 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, 24792133 + ... + 24792184.

Almost surely, 2^1289192242 is an apocalyptic number.

1289192242 is a deficient number, since it is larger than the sum of its proper divisors (793349114).

1289192242 is a wasteful number, since it uses less digits than its factorization.

1289192242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49584332.

The product of its digits is 41472, while the sum is 40.

The square root of 1289192242 is about 35905.3233100609. The cubic root of 1289192242 is about 1088.3599728215.

The spelling of 1289192242 in words is "one billion, two hundred eighty-nine million, one hundred ninety-two thousand, two hundred forty-two".