247386139 has 32 divisors (see below), whose sum is σ = 338494464. Its totient is φ = 174545280.

The previous prime is 247386133. The next prime is 247386149. The reversal of 247386139 is 931683742.

It is not a de Polignac number, because 247386139 - 2⁷ = 247386011 is a prime.

It is a super-2 number, since 2×247386139² = 122399803538654642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 247386095 and 247386104.

It is not an unprimeable number, because it can be changed into a prime (247386133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50722 + ... + 55384.

It is an arithmetic number, because the mean of its divisors is an integer number (10577952).

Almost surely, 2^247386139 is an apocalyptic number.

247386139 is a deficient number, since it is larger than the sum of its proper divisors (91108325).

247386139 is a wasteful number, since it uses less digits than its factorization.

247386139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4747.

The product of its digits is 217728, while the sum is 43.

The square root of 247386139 is about 15728.5135661321. The cubic root of 247386139 is about 627.7573228642.

The spelling of 247386139 in words is "two hundred forty-seven million, three hundred eighty-six thousand, one hundred thirty-nine".