247673309 has 8 divisors (see below), whose sum is σ = 268426200. Its totient is φ = 227163456.

The previous prime is 247673299. The next prime is 247673317. The reversal of 247673309 is 903376742.

It can be written as a sum of positive squares in 4 ways, for example, as 2656900 + 245016409 = 1630^2 + 15653^2 .

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

It is not a de Polignac number, because 247673309 - 2²⁴ = 230896093 is a prime.

It is a super-2 number, since 2×247673309² = 122684135982018962, 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 (247673009) 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, 58634 + ... + 62715.

It is an arithmetic number, because the mean of its divisors is an integer number (33553275).

Almost surely, 2^247673309 is an apocalyptic number.

It is an amenable number.

247673309 is a deficient number, since it is larger than the sum of its proper divisors (20752891).

247673309 is a wasteful number, since it uses less digits than its factorization.

247673309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121519.

The product of its (nonzero) digits is 190512, while the sum is 41.

The square root of 247673309 is about 15737.6398802362. The cubic root of 247673309 is about 628.0001326964. Note that the first 3 decimals are identical.

The spelling of 247673309 in words is "two hundred forty-seven million, six hundred seventy-three thousand, three hundred nine".