42749 has 8 divisors (see below), whose sum is σ = 50688. Its totient is φ = 35280.

The previous prime is 42743. The next prime is 42751. The reversal of 42749 is 94724.

42749 = T₁₀₇ + T₁₀₈ + ... + T₁₁₃.

42749 is nontrivially palindromic in base 6.

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

It is not a de Polignac number, because 42749 - 2¹² = 38653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42743) 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 7 ways as a sum of consecutive naturals, for example, 119 + ... + 315.

It is an arithmetic number, because the mean of its divisors is an integer number (6336).

2⁴²⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

42749 is a deficient number, since it is larger than the sum of its proper divisors (7939).

42749 is a wasteful number, since it uses less digits than its factorization.

42749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235.

The product of its digits is 2016, while the sum is 26.

The square root of 42749 is about 206.7583130130. The cubic root of 42749 is about 34.9656806448.

The spelling of 42749 in words is "forty-two thousand, seven hundred forty-nine".