1298122389 has 32 divisors (see below), whose sum is σ = 2094192000. Its totient is φ = 791586432.

The previous prime is 1298122381. The next prime is 1298122403. The reversal of 1298122389 is 9832218921.

It is a happy number.

It is not a de Polignac number, because 1298122389 - 2³ = 1298122381 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1298122381) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28752 + ... + 58505.

It is an arithmetic number, because the mean of its divisors is an integer number (65443500).

Almost surely, 2^1298122389 is an apocalyptic number.

1298122389 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1298122389 is a deficient number, since it is larger than the sum of its proper divisors (796069611).

1298122389 is a wasteful number, since it uses less digits than its factorization.

1298122389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87314 (or 87308 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 1298122389 is about 36029.4655663944. The cubic root of 1298122389 is about 1090.8671911010.

The spelling of 1298122389 in words is "one billion, two hundred ninety-eight million, one hundred twenty-two thousand, three hundred eighty-nine".