42718691 has 4 divisors (see below), whose sum is σ = 42738000. Its totient is φ = 42699384.

The previous prime is 42718681. The next prime is 42718693. The reversal of 42718691 is 19681724.

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 42718691 - 2¹⁴ = 42702307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42718693) 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, 5831 + ... + 10928.

It is an arithmetic number, because the mean of its divisors is an integer number (10684500).

Almost surely, 2^42718691 is an apocalyptic number.

42718691 is a deficient number, since it is larger than the sum of its proper divisors (19309).

42718691 is a wasteful number, since it uses less digits than its factorization.

42718691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19308.

The product of its digits is 24192, while the sum is 38.

The square root of 42718691 is about 6535.9537177064. The cubic root of 42718691 is about 349.5741514637.

The spelling of 42718691 in words is "forty-two million, seven hundred eighteen thousand, six hundred ninety-one".