247720041 has 6 divisors (see below), whose sum is σ = 357817850. Its totient is φ = 165146688.

The previous prime is 247720027. The next prime is 247720061. The reversal of 247720041 is 140027742.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 228614400 + 19105641 = 15120^2 + 4371^2 .

It is not a de Polignac number, because 247720041 - 2⁵ = 247720009 is a prime.

It is a super-2 number, since 2×247720041² = 122730437426083362, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 247719987 and 247720014.

It is not an unprimeable number, because it can be changed into a prime (247720021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13762216 + ... + 13762233.

Almost surely, 2^247720041 is an apocalyptic number.

It is an amenable number.

247720041 is a deficient number, since it is larger than the sum of its proper divisors (110097809).

247720041 is a wasteful number, since it uses less digits than its factorization.

247720041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27524455 (or 27524452 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 27.

The square root of 247720041 is about 15739.1245309261. The cubic root of 247720041 is about 628.0396280793.

Adding to 247720041 its reverse (140027742), we get a palindrome (387747783).

The spelling of 247720041 in words is "two hundred forty-seven million, seven hundred twenty thousand, forty-one".