247881 has 8 divisors (see below), whose sum is σ = 336960. Its totient is φ = 162032.

The previous prime is 247879. The next prime is 247889. The reversal of 247881 is 188742.

247881 = T₆₉ + T₇₀ + ... + T₁₂₁.

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

It is a cyclic number.

It is not a de Polignac number, because 247881 - 2¹ = 247879 is a prime.

It is a super-2 number, since 2×247881² = 122889980322, which contains 22 as substring.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (247889) 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, 621 + ... + 938.

It is an arithmetic number, because the mean of its divisors is an integer number (42120).

2²⁴⁷⁸⁸¹ is an apocalyptic number.

It is an amenable number.

247881 is a deficient number, since it is larger than the sum of its proper divisors (89079).

247881 is a wasteful number, since it uses less digits than its factorization.

247881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1615.

The product of its digits is 3584, while the sum is 30.

The square root of 247881 is about 497.8764907083. The cubic root of 247881 is about 62.8175623998.

It can be divided in two parts, 247 and 881, that added together give a triangular number (1128 = T₄₇).

The spelling of 247881 in words is "two hundred forty-seven thousand, eight hundred eighty-one".