247839145 has 12 divisors (see below), whose sum is σ = 310903236. Its totient is φ = 189648800.

The previous prime is 247839127. The next prime is 247839187. The reversal of 247839145 is 541938742.

It can be written as a sum of positive squares in 2 ways, for example, as 180418624 + 67420521 = 13432^2 + 8211^2 .

It is not a de Polignac number, because 247839145 - 2⁵ = 247839113 is a prime.

It is a super-2 number, since 2×247839145² = 122848483588662050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44206 + ... + 49495.

It is an arithmetic number, because the mean of its divisors is an integer number (25908603).

Almost surely, 2^247839145 is an apocalyptic number.

It is an amenable number.

247839145 is a deficient number, since it is larger than the sum of its proper divisors (63064091).

247839145 is an equidigital number, since it uses as much as digits as its factorization.

247839145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93752 (or 93729 counting only the distinct ones).

The product of its digits is 241920, while the sum is 43.

The square root of 247839145 is about 15742.9077682619. The cubic root of 247839145 is about 628.1402659425.

The spelling of 247839145 in words is "two hundred forty-seven million, eight hundred thirty-nine thousand, one hundred forty-five".