1298197906 has 4 divisors (see below), whose sum is σ = 1947296862. Its totient is φ = 649098952.

The previous prime is 1298197903. The next prime is 1298197919. The reversal of 1298197906 is 6097918921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6097918921 = 17 ⋅358701113.

It can be written as a sum of positive squares in only one way, i.e., 989668681 + 308529225 = 31459^2 + 17565^2 .

It is not an unprimeable number, because it can be changed into a prime (1298197903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324549475 + ... + 324549478.

Almost surely, 2^1298197906 is an apocalyptic number.

1298197906 is a deficient number, since it is larger than the sum of its proper divisors (649098956).

1298197906 is an equidigital number, since it uses as much as digits as its factorization.

1298197906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649098955.

The product of its (nonzero) digits is 489888, while the sum is 52.

The square root of 1298197906 is about 36030.5135406089. The cubic root of 1298197906 is about 1090.8883440680. Note that the first 3 decimals are identical.

The spelling of 1298197906 in words is "one billion, two hundred ninety-eight million, one hundred ninety-seven thousand, nine hundred six".