42806311 has 4 divisors (see below), whose sum is σ = 42821512. Its totient is φ = 42791112.

The previous prime is 42806303. The next prime is 42806333. The reversal of 42806311 is 11360824.

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 42806311 - 2³ = 42806303 is a prime.

It is a super-2 number, since 2×42806311² = 3664760522857442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42806111) 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, 2001 + ... + 9466.

It is an arithmetic number, because the mean of its divisors is an integer number (10705378).

Almost surely, 2^42806311 is an apocalyptic number.

42806311 is a deficient number, since it is larger than the sum of its proper divisors (15201).

42806311 is a wasteful number, since it uses less digits than its factorization.

42806311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15200.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 42806311 is about 6542.6532079883. The cubic root of 42806311 is about 349.8129912535.

The spelling of 42806311 in words is "forty-two million, eight hundred six thousand, three hundred eleven".