1289245247 has 8 divisors (see below), whose sum is σ = 1369785600. Its totient is φ = 1209973464.

The previous prime is 1289245231. The next prime is 1289245253. The reversal of 1289245247 is 7425429821.

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

It is a cyclic number.

It is not a de Polignac number, because 1289245247 - 2⁴ = 1289245231 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1289245198 and 1289245207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289245147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 315047 + ... + 319112.

It is an arithmetic number, because the mean of its divisors is an integer number (171223200).

Almost surely, 2^1289245247 is an apocalyptic number.

1289245247 is a deficient number, since it is larger than the sum of its proper divisors (80540353).

1289245247 is a wasteful number, since it uses less digits than its factorization.

1289245247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634285.

The product of its digits is 322560, while the sum is 44.

The square root of 1289245247 is about 35906.0614242220. The cubic root of 1289245247 is about 1088.3748885514.

The spelling of 1289245247 in words is "one billion, two hundred eighty-nine million, two hundred forty-five thousand, two hundred forty-seven".