247255385 has 32 divisors (see below), whose sum is σ = 326592000. Its totient is φ = 178603776.

The previous prime is 247255381. The next prime is 247255399. The reversal of 247255385 is 583552742.

It is not a de Polignac number, because 247255385 - 2² = 247255381 is a prime.

It is a super-2 number, since 2×247255385² = 122270450822996450, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (247255381) 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, 919031 + ... + 919299.

It is an arithmetic number, because the mean of its divisors is an integer number (10206000).

Almost surely, 2^247255385 is an apocalyptic number.

It is an amenable number.

247255385 is a deficient number, since it is larger than the sum of its proper divisors (79336615).

247255385 is a wasteful number, since it uses less digits than its factorization.

247255385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545.

The product of its digits is 336000, while the sum is 41.

The square root of 247255385 is about 15724.3564256220. The cubic root of 247255385 is about 627.6467046396.

The spelling of 247255385 in words is "two hundred forty-seven million, two hundred fifty-five thousand, three hundred eighty-five".