1308688947 has 8 divisors (see below), whose sum is σ = 1938798480. Its totient is φ = 872459280.

The previous prime is 1308688939. The next prime is 1308688949. The reversal of 1308688947 is 7498868031.

It is not a de Polignac number, because 1308688947 - 2³ = 1308688939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1308688893 and 1308688902.

It is not an unprimeable number, because it can be changed into a prime (1308688949) 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, 24234954 + ... + 24235007.

It is an arithmetic number, because the mean of its divisors is an integer number (242349810).

Almost surely, 2^1308688947 is an apocalyptic number.

1308688947 is a deficient number, since it is larger than the sum of its proper divisors (630109533).

1308688947 is an equidigital number, since it uses as much as digits as its factorization.

1308688947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48469970 (or 48469964 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The square root of 1308688947 is about 36175.8061002101. The cubic root of 1308688947 is about 1093.8190382892.

The spelling of 1308688947 in words is "one billion, three hundred eight million, six hundred eighty-eight thousand, nine hundred forty-seven".