249870 has 16 divisors (see below), whose sum is σ = 599760. Its totient is φ = 66624.

The previous prime is 249863. The next prime is 249871. The reversal of 249870 is 78942.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 8329 = 249870 / (2 + 4 + 9 + 8 + 7 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249871) by changing a digit.

249870 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4135 + ... + 4194.

It is an arithmetic number, because the mean of its divisors is an integer number (37485).

2²⁴⁹⁸⁷⁰ is an apocalyptic number.

249870 is an abundant number, since it is smaller than the sum of its proper divisors (349890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

249870 is a wasteful number, since it uses less digits than its factorization.

249870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8339.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 249870 is about 499.8699830956. The cubic root of 249870 is about 62.9851312857.

The spelling of 249870 in words is "two hundred forty-nine thousand, eight hundred seventy".