7948257409 has 3 divisors (see below), whose sum is σ = 7948346563. Its totient is φ = 7948168256.

The previous prime is 7948257347. The next prime is 7948257419. The reversal of 7948257409 is 9047528497.

The square root of 7948257409 is 89153.

It is a perfect power (a square), and thus also a powerful number.

7948257409 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1844273025 + 6103984384 = 42945^2 + 78128^2 .

It is a de Polignac number, because none of the positive numbers 2^k-7948257409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7948257409.

It is not an unprimeable number, because it can be changed into a prime (7948257419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 44577 + ... + 133729.

Almost surely, 2^7948257409 is an apocalyptic number.

7948257409 is the 89153-rd square number.

7948257409 is the 44577-th centered octagonal number.

It is an amenable number.

7948257409 is a deficient number, since it is larger than the sum of its proper divisors (89154).

7948257409 is an frugal number, since it uses more digits than its factorization.

7948257409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178306 (or 89153 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 55.

The cubic root of 7948257409 is about 1995.6787877029.

The spelling of 7948257409 in words is "seven billion, nine hundred forty-eight million, two hundred fifty-seven thousand, four hundred nine".