247904305 has 32 divisors (see below), whose sum is σ = 347299200. Its totient is φ = 167961600.

The previous prime is 247904257. The next prime is 247904309. The reversal of 247904305 is 503409742.

247904305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 247904305 - 2⁷ = 247904177 is a prime.

It is a super-2 number, since 2×247904305² = 122913088875066050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (247904309) 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, 61801 + ... + 65689.

It is an arithmetic number, because the mean of its divisors is an integer number (10853100).

Almost surely, 2^247904305 is an apocalyptic number.

It is an amenable number.

247904305 is a deficient number, since it is larger than the sum of its proper divisors (99394895).

247904305 is a wasteful number, since it uses less digits than its factorization.

247904305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3985.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 247904305 is about 15744.9771355820. The cubic root of 247904305 is about 628.1953097537.

The spelling of 247904305 in words is "two hundred forty-seven million, nine hundred four thousand, three hundred five".