42409871 has 4 divisors (see below), whose sum is σ = 48468432. Its totient is φ = 36351312.

The previous prime is 42409859. The next prime is 42409889. The reversal of 42409871 is 17890424.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42409871 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 (42409811) 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, 3029270 + ... + 3029283.

It is an arithmetic number, because the mean of its divisors is an integer number (12117108).

Almost surely, 2^42409871 is an apocalyptic number.

42409871 is a deficient number, since it is larger than the sum of its proper divisors (6058561).

42409871 is an equidigital number, since it uses as much as digits as its factorization.

42409871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6058560.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 42409871 is about 6512.2861577176. The cubic root of 42409871 is about 348.7297382489.

The spelling of 42409871 in words is "forty-two million, four hundred nine thousand, eight hundred seventy-one".