247715247 has 8 divisors (see below), whose sum is σ = 355693744. Its totient is φ = 152440128.

The previous prime is 247715231. The next prime is 247715249. The reversal of 247715247 is 742517742.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 247715247 - 2⁴ = 247715231 is a prime.

It is a super-2 number, since 2×247715247² = 122725687192542018, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 6351673 = 247715247 / (2 + 4 + 7 + 7 + 1 + 5 + 2 + 4 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247715249) 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, 3175798 + ... + 3175875.

It is an arithmetic number, because the mean of its divisors is an integer number (44461718).

Almost surely, 2^247715247 is an apocalyptic number.

247715247 is a deficient number, since it is larger than the sum of its proper divisors (107978497).

247715247 is a wasteful number, since it uses less digits than its factorization.

247715247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6351689.

The product of its digits is 109760, while the sum is 39.

The square root of 247715247 is about 15738.9722345520. The cubic root of 247715247 is about 628.0355766760.

The spelling of 247715247 in words is "two hundred forty-seven million, seven hundred fifteen thousand, two hundred forty-seven".