1247207808 has 128 divisors (see below), whose sum is σ = 4130461440. Its totient is φ = 323942400.

The previous prime is 1247207789. The next prime is 1247207809. The reversal of 1247207808 is 8087027421.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247207809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8478 + ... + 50658.

It is an arithmetic number, because the mean of its divisors is an integer number (32269230).

Almost surely, 2^1247207808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1247207808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2065230720).

1247207808 is an abundant number, since it is smaller than the sum of its proper divisors (2883253632).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1247207808 is a wasteful number, since it uses less digits than its factorization.

1247207808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42216 (or 42204 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 39.

The square root of 1247207808 is about 35315.8294253441. The cubic root of 1247207808 is about 1076.4146676837.

The spelling of 1247207808 in words is "one billion, two hundred forty-seven million, two hundred seven thousand, eight hundred eight".