247440461 has 8 divisors (see below), whose sum is σ = 251974200. Its totient is φ = 242922240.

The previous prime is 247440437. The next prime is 247440469. The reversal of 247440461 is 164044742.

It can be written as a sum of positive squares in 4 ways, for example, as 164836 + 247275625 = 406^2 + 15725^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-247440461 is a prime.

It is a super-2 number, since 2×247440461² = 122453563479785042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247440469) 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 in 7 ways as a sum of consecutive naturals, for example, 31145 + ... + 38273.

It is an arithmetic number, because the mean of its divisors is an integer number (31496775).

Almost surely, 2^247440461 is an apocalyptic number.

It is an amenable number.

247440461 is a deficient number, since it is larger than the sum of its proper divisors (4533739).

247440461 is an equidigital number, since it uses as much as digits as its factorization.

247440461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7759.

The product of its (nonzero) digits is 21504, while the sum is 32.

The square root of 247440461 is about 15730.2403350998. The cubic root of 247440461 is about 627.8032679573.

The spelling of 247440461 in words is "two hundred forty-seven million, four hundred forty thousand, four hundred sixty-one".