1289945884427 has 4 divisors (see below), whose sum is σ = 1289948253336. Its totient is φ = 1289943515520.

The previous prime is 1289945884399. The next prime is 1289945884459. The reversal of 1289945884427 is 7244885499821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1289945884427 - 2²² = 1289941690123 is a prime.

It is a super-2 number, since 2×1289945884427² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1289945884727) 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, 88028 + ... + 1608614.

It is an arithmetic number, because the mean of its divisors is an integer number (322487063334).

Almost surely, 2^{1289945884427} is an apocalyptic number.

1289945884427 is a deficient number, since it is larger than the sum of its proper divisors (2368909).

1289945884427 is an equidigital number, since it uses as much as digits as its factorization.

1289945884427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2368908.

The product of its digits is 371589120, while the sum is 71.

The spelling of 1289945884427 in words is "one trillion, two hundred eighty-nine billion, nine hundred forty-five million, eight hundred eighty-four thousand, four hundred twenty-seven".