42949871 has 4 divisors (see below), whose sum is σ = 45476352. Its totient is φ = 40423392.

The previous prime is 42949853. The next prime is 42949873. The reversal of 42949871 is 17894924.

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 42949871 - 2¹⁰ = 42948847 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 (42949873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1263215 + ... + 1263248.

It is an arithmetic number, because the mean of its divisors is an integer number (11369088).

Almost surely, 2^42949871 is an apocalyptic number.

42949871 is a deficient number, since it is larger than the sum of its proper divisors (2526481).

42949871 is a wasteful number, since it uses less digits than its factorization.

42949871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2526480.

The product of its digits is 145152, while the sum is 44.

The square root of 42949871 is about 6553.6151092355. The cubic root of 42949871 is about 350.2036121381.

The spelling of 42949871 in words is "forty-two million, nine hundred forty-nine thousand, eight hundred seventy-one".