247390839 has 12 divisors (see below), whose sum is σ = 357485856. Its totient is φ = 164860992.

The previous prime is 247390831. The next prime is 247390853. The reversal of 247390839 is 938093742.

It is a happy number.

It is not a de Polignac number, because 247390839 - 2³ = 247390831 is a prime.

It is a super-2 number, since 2×247390839² = 122404454442247842, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 247390794 and 247390803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247390831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30514 + ... + 37760.

It is an arithmetic number, because the mean of its divisors is an integer number (29790488).

Almost surely, 2^247390839 is an apocalyptic number.

247390839 is a deficient number, since it is larger than the sum of its proper divisors (110095017).

247390839 is a wasteful number, since it uses less digits than its factorization.

247390839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11046 (or 11043 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 247390839 is about 15728.6629755997. The cubic root of 247390839 is about 627.7612983506.

The spelling of 247390839 in words is "two hundred forty-seven million, three hundred ninety thousand, eight hundred thirty-nine".