247211730 has 128 divisors (see below), whose sum is σ = 684288000. Its totient is φ = 63467712.

The previous prime is 247211719. The next prime is 247211749. The reversal of 247211730 is 37112742.

It is a happy number.

It is a super-2 number, since 2×247211730² = 122227278899185800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 247211694 and 247211703.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1242171 + ... + 1242369.

It is an arithmetic number, because the mean of its divisors is an integer number (5346000).

Almost surely, 2^247211730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 247211730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (342144000).

247211730 is an abundant number, since it is smaller than the sum of its proper divisors (437076270).

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

247211730 is a wasteful number, since it uses less digits than its factorization.

247211730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365 (or 359 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 247211730 is about 15722.9682312215. The cubic root of 247211730 is about 627.6097637123.

The spelling of 247211730 in words is "two hundred forty-seven million, two hundred eleven thousand, seven hundred thirty".