249139 has 12 divisors (see below), whose sum is σ = 287280. Its totient is φ = 215600.

The previous prime is 249133. The next prime is 249143. The reversal of 249139 is 931942.

It is a happy number.

It is not a de Polignac number, because 249139 - 2³ = 249131 is a prime.

It is a Duffinian number.

249139 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3474 + ... + 3544.

It is an arithmetic number, because the mean of its divisors is an integer number (23940).

2²⁴⁹¹³⁹ is an apocalyptic number.

249139 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

249139 is a deficient number, since it is larger than the sum of its proper divisors (38141).

249139 is a wasteful number, since it uses less digits than its factorization.

249139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122 (or 111 counting only the distinct ones).

The product of its digits is 1944, while the sum is 28.

The square root of 249139 is about 499.1382573997. The cubic root of 249139 is about 62.9236498445.

It can be divided in two parts, 2 and 49139, that added together give a triangular number (49141 = T₃₁₃).

The spelling of 249139 in words is "two hundred forty-nine thousand, one hundred thirty-nine".