249666839 has 12 divisors (see below), whose sum is σ = 262271160. Its totient is φ = 237596400.

The previous prime is 249666799. The next prime is 249666871. The reversal of 249666839 is 938666942.

It is not a de Polignac number, because 249666839 - 2²⁰ = 248618263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249666239) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56492 + ... + 60750.

It is an arithmetic number, because the mean of its divisors is an integer number (21855930).

Almost surely, 2^249666839 is an apocalyptic number.

249666839 is a deficient number, since it is larger than the sum of its proper divisors (12604321).

249666839 is an equidigital number, since it uses as much as digits as its factorization.

249666839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4382 (or 4351 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 53.

The square root of 249666839 is about 15800.8493126161. The cubic root of 249666839 is about 629.6805628427.

The spelling of 249666839 in words is "two hundred forty-nine million, six hundred sixty-six thousand, eight hundred thirty-nine".