247904129 has 8 divisors (see below), whose sum is σ = 271056672. Its totient is φ = 224854240.

The previous prime is 247904119. The next prime is 247904147. The reversal of 247904129 is 921409742.

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-247904129 is a prime.

It is a super-2 number, since 2×247904129² = 122912914350497282, 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 = 247904092 and 247904101.

It is not an unprimeable number, because it can be changed into a prime (247904119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20564 + ... + 30309.

It is an arithmetic number, because the mean of its divisors is an integer number (33882084).

Almost surely, 2^247904129 is an apocalyptic number.

It is an amenable number.

247904129 is a deficient number, since it is larger than the sum of its proper divisors (23152543).

247904129 is a wasteful number, since it uses less digits than its factorization.

247904129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51327.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 247904129 is about 15744.9715464970. The cubic root of 247904129 is about 628.1951610909.

The spelling of 247904129 in words is "two hundred forty-seven million, nine hundred four thousand, one hundred twenty-nine".