42849391 has 16 divisors (see below), whose sum is σ = 48545280. Its totient is φ = 37524960.

The previous prime is 42849379. The next prime is 42849403. The reversal of 42849391 is 19394824.

It is an interprime number because it is at equal distance from previous prime (42849379) and next prime (42849403).

It is not a de Polignac number, because 42849391 - 2¹⁵ = 42816623 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 (42849311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41046 + ... + 42076.

It is an arithmetic number, because the mean of its divisors is an integer number (3034080).

Almost surely, 2^42849391 is an apocalyptic number.

42849391 is a deficient number, since it is larger than the sum of its proper divisors (5695889).

42849391 is a wasteful number, since it uses less digits than its factorization.

42849391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1206.

The product of its digits is 62208, while the sum is 40.

The square root of 42849391 is about 6545.9446224361. The cubic root of 42849391 is about 349.9303017676.

The spelling of 42849391 in words is "forty-two million, eight hundred forty-nine thousand, three hundred ninety-one".