247139847 has 12 divisors (see below), whose sum is σ = 357203184. Its totient is φ = 164656800.

The previous prime is 247139833. The next prime is 247139873. The reversal of 247139847 is 748931742.

It is not a de Polignac number, because 247139847 - 2¹¹ = 247137799 is a prime.

It is a super-2 number, since 2×247139847² = 122156207950366818, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247139647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8347 + ... + 23747.

It is an arithmetic number, because the mean of its divisors is an integer number (29766932).

Almost surely, 2^247139847 is an apocalyptic number.

247139847 is a deficient number, since it is larger than the sum of its proper divisors (110063337).

247139847 is a wasteful number, since it uses less digits than its factorization.

247139847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17190 (or 17187 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 247139847 is about 15720.6821416884. The cubic root of 247139847 is about 627.5489267311.

It can be divided in two parts, 24 and 7139847, that multiplied together give a triangular number (171356328 = T₁₈₅₁₂).

The spelling of 247139847 in words is "two hundred forty-seven million, one hundred thirty-nine thousand, eight hundred forty-seven".