247939881 has 32 divisors (see below), whose sum is σ = 385689600. Its totient is φ = 138754560.

The previous prime is 247939859. The next prime is 247939897. The reversal of 247939881 is 188939742.

247939881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 247939881 - 2⁶ = 247939817 is a prime.

It is a super-2 number, since 2×247939881² = 122948369180588322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (247939801) 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, 266425 + ... + 267353.

It is an arithmetic number, because the mean of its divisors is an integer number (12052800).

Almost surely, 2^247939881 is an apocalyptic number.

247939881 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

247939881 is a deficient number, since it is larger than the sum of its proper divisors (137749719).

247939881 is a wasteful number, since it uses less digits than its factorization.

247939881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189.

The product of its digits is 870912, while the sum is 51.

The square root of 247939881 is about 15746.1068521714. The cubic root of 247939881 is about 628.2253584551.

The spelling of 247939881 in words is "two hundred forty-seven million, nine hundred thirty-nine thousand, eight hundred eighty-one".