247725139 has 4 divisors (see below), whose sum is σ = 262297224. Its totient is φ = 233153056.

The previous prime is 247725113. The next prime is 247725143. The reversal of 247725139 is 931527742.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 247725139 - 2¹³ = 247716947 is a prime.

It is a super-2 number, since 2×247725139² = 122735488985138642, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247725539) 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 3 ways as a sum of consecutive naturals, for example, 7286017 + ... + 7286050.

It is an arithmetic number, because the mean of its divisors is an integer number (65574306).

Almost surely, 2^247725139 is an apocalyptic number.

247725139 is a deficient number, since it is larger than the sum of its proper divisors (14572085).

247725139 is a wasteful number, since it uses less digits than its factorization.

247725139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14572084.

The product of its digits is 105840, while the sum is 40.

The square root of 247725139 is about 15739.2864831923. The cubic root of 247725139 is about 628.0439363353.

The spelling of 247725139 in words is "two hundred forty-seven million, seven hundred twenty-five thousand, one hundred thirty-nine".