247442144 has 12 divisors (see below), whose sum is σ = 487151784. Its totient is φ = 123721056.

The previous prime is 247442131. The next prime is 247442147. The reversal of 247442144 is 441244742.

It is a super-2 number, since 2×247442144² = 122455229254633472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 7732567 = 247442144 / (2 + 4 + 7 + 4 + 4 + 2 + 1 + 4 + 4).

It is a self number, because there is not a number n which added to its sum of digits gives 247442144.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247442147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3866252 + ... + 3866315.

It is an arithmetic number, because the mean of its divisors is an integer number (40595982).

Almost surely, 2^247442144 is an apocalyptic number.

It is an amenable number.

247442144 is a deficient number, since it is larger than the sum of its proper divisors (239709640).

247442144 is an equidigital number, since it uses as much as digits as its factorization.

247442144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7732577 (or 7732569 counting only the distinct ones).

The product of its digits is 28672, while the sum is 32.

The square root of 247442144 is about 15730.2938306950. The cubic root of 247442144 is about 627.8046913172.

Adding to 247442144 its reverse (441244742), we get a palindrome (688686886).

The spelling of 247442144 in words is "two hundred forty-seven million, four hundred forty-two thousand, one hundred forty-four".