247312305 has 32 divisors (see below), whose sum is σ = 441129600. Its totient is φ = 131461056.

The previous prime is 247312301. The next prime is 247312309. The reversal of 247312305 is 503213742.

247312305 is a `hidden beast` number, since 2 + 47 + 312 + 305 = 666.

It is an interprime number because it is at equal distance from previous prime (247312301) and next prime (247312309).

It is not a de Polignac number, because 247312305 - 2² = 247312301 is a prime.

It is a super-2 number, since 2×247312305² = 122326752408826050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (247312301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39906 + ... + 45684.

It is an arithmetic number, because the mean of its divisors is an integer number (13785300).

Almost surely, 2^247312305 is an apocalyptic number.

It is an amenable number.

247312305 is a deficient number, since it is larger than the sum of its proper divisors (193817295).

247312305 is a wasteful number, since it uses less digits than its factorization.

247312305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6110 (or 6104 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 247312305 is about 15726.1662524596. The cubic root of 247312305 is about 627.6948638999.

The spelling of 247312305 in words is "two hundred forty-seven million, three hundred twelve thousand, three hundred five".