42849431 has 4 divisors (see below), whose sum is σ = 42864864. Its totient is φ = 42834000.

The previous prime is 42849413. The next prime is 42849451. The reversal of 42849431 is 13494824.

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

It is a cyclic number.

It is not a de Polignac number, because 42849431 - 2¹⁸ = 42587287 is a prime.

It is a super-2 number, since 2×42849431² = 3672147474047522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42849391 and 42849400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42849451) 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, 2270 + ... + 9531.

It is an arithmetic number, because the mean of its divisors is an integer number (10716216).

Almost surely, 2^42849431 is an apocalyptic number.

42849431 is a deficient number, since it is larger than the sum of its proper divisors (15433).

42849431 is a wasteful number, since it uses less digits than its factorization.

42849431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15432.

The product of its digits is 27648, while the sum is 35.

The square root of 42849431 is about 6545.9476777622. The cubic root of 42849431 is about 349.9304106545.

The spelling of 42849431 in words is "forty-two million, eight hundred forty-nine thousand, four hundred thirty-one".