249378839 has 2 divisors, whose sum is σ = 249378840. Its totient is φ = 249378838.

The previous prime is 249378827. The next prime is 249378841. The reversal of 249378839 is 938873942.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 249378839 - 2¹² = 249374743 is a prime.

Together with 249378841, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249378869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124689419 + 124689420.

It is an arithmetic number, because the mean of its divisors is an integer number (124689420).

Almost surely, 2^249378839 is an apocalyptic number.

249378839 is a deficient number, since it is larger than the sum of its proper divisors (1).

249378839 is an equidigital number, since it uses as much as digits as its factorization.

249378839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 53.

The square root of 249378839 is about 15791.7332487603. The cubic root of 249378839 is about 629.4383496890.

The spelling of 249378839 in words is "two hundred forty-nine million, three hundred seventy-eight thousand, eight hundred thirty-nine".