1289870242 has 8 divisors (see below), whose sum is σ = 1935212076. Its totient is φ = 644799552.

The previous prime is 1289870201. The next prime is 1289870249. The reversal of 1289870242 is 2420789821.

It can be written as a sum of positive squares in 2 ways, for example, as 1197921321 + 91948921 = 34611^2 + 9589^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1289870249) 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, 55443 + ... + 75190.

Almost surely, 2^1289870242 is an apocalyptic number.

1289870242 is a deficient number, since it is larger than the sum of its proper divisors (645341834).

1289870242 is a wasteful number, since it uses less digits than its factorization.

1289870242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135572.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 1289870242 is about 35914.7635659766. The cubic root of 1289870242 is about 1088.5507327711.

The spelling of 1289870242 in words is "one billion, two hundred eighty-nine million, eight hundred seventy thousand, two hundred forty-two".