249742 has 8 divisors (see below), whose sum is σ = 377136. Its totient is φ = 124032.

The previous prime is 249737. The next prime is 249749. The reversal of 249742 is 247942.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a d-powerful number, because it can be written as 2⁵ + 4 + 7⁶ + 9³ + 4⁴ + 2¹⁷ .

It is a self number, because there is not a number n which added to its sum of digits gives 249742.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249749) by changing a digit.

249742 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 3 ways as a sum of consecutive naturals, for example, 63 + ... + 709.

It is an arithmetic number, because the mean of its divisors is an integer number (47142).

2²⁴⁹⁷⁴² is an apocalyptic number.

249742 is a deficient number, since it is larger than the sum of its proper divisors (127394).

249742 is a wasteful number, since it uses less digits than its factorization.

249742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842.

The product of its digits is 4032, while the sum is 28.

The square root of 249742 is about 499.7419334016. The cubic root of 249742 is about 62.9743743937.

It can be divided in two parts, 24974 and 2, that added together give a triangular number (24976 = T₂₂₃).

The spelling of 249742 in words is "two hundred forty-nine thousand, seven hundred forty-two".