42851749 has 4 divisors (see below), whose sum is σ = 42879564. Its totient is φ = 42823936.

The previous prime is 42851723. The next prime is 42851771. The reversal of 42851749 is 94715824.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20930625 + 21921124 = 4575^2 + 4682^2 .

It is a 4-Lehmer number, since φ(42851749) divides (42851749-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 42851749 - 2⁵ = 42851717 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42855749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11452 + ... + 14725.

It is an arithmetic number, because the mean of its divisors is an integer number (10719891).

Almost surely, 2^42851749 is an apocalyptic number.

It is an amenable number.

42851749 is a deficient number, since it is larger than the sum of its proper divisors (27815).

42851749 is a wasteful number, since it uses less digits than its factorization.

42851749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27814.

The product of its digits is 80640, while the sum is 40.

The square root of 42851749 is about 6546.1247314728. The cubic root of 42851749 is about 349.9367205326.

The spelling of 42851749 in words is "forty-two million, eight hundred fifty-one thousand, seven hundred forty-nine".