247212729 has 15 divisors (see below), whose sum is σ = 369504597. Its totient is φ = 164714148.

The previous prime is 247212727. The next prime is 247212731. The reversal of 247212729 is 927212742.

The square root of 247212729 is 15723.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (247212727) and next prime (247212731).

It is not a de Polignac number, because 247212729 - 2¹ = 247212727 is a prime.

It is a super-2 number, since 2×247212729² = 122228266759254882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 247212693 and 247212702.

It is not an unprimeable number, because it can be changed into a prime (247212727) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 140634 + ... + 142380.

Almost surely, 2^247212729 is an apocalyptic number.

247212729 is the 15723-rd square number.

247212729 is the 7862-nd centered octagonal number.

It is an amenable number.

247212729 is a deficient number, since it is larger than the sum of its proper divisors (122291868).

247212729 is an frugal number, since it uses more digits than its factorization.

247212729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3506 (or 1750 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The cubic root of 247212729 is about 627.6106091162.

Multiplying 247212729 by its sum of digits (36), we get a square (8899658244 = 94338²).

Multiplying 247212729 by its product of digits (28224), we get a square (6977332063296 = 2641464²).

The spelling of 247212729 in words is "two hundred forty-seven million, two hundred twelve thousand, seven hundred twenty-nine".