247931424 has 72 divisors (see below), whose sum is σ = 759301452. Its totient is φ = 76285440.

The previous prime is 247931419. The next prime is 247931429. The reversal of 247931424 is 424139742.

It is an interprime number because it is at equal distance from previous prime (247931419) and next prime (247931429).

It can be written as a sum of positive squares in 2 ways, for example, as 247495824 + 435600 = 15732^2 + 660^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×247931424² = 122939982013335552, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (247931429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29367 + ... + 36854.

Almost surely, 2^247931424 is an apocalyptic number.

247931424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

247931424 is an abundant number, since it is smaller than the sum of its proper divisors (511370028).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

247931424 is a wasteful number, since it uses less digits than its factorization.

247931424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66250 (or 66239 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 247931424 is about 15745.8383073116. The cubic root of 247931424 is about 628.2182156453.

The spelling of 247931424 in words is "two hundred forty-seven million, nine hundred thirty-one thousand, four hundred twenty-four".