42206891 has 4 divisors (see below), whose sum is σ = 42332472. Its totient is φ = 42081312.

The previous prime is 42206887. The next prime is 42206897. The reversal of 42206891 is 19860224.

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 42206891 - 2² = 42206887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42206897) 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, 62285 + ... + 62958.

It is an arithmetic number, because the mean of its divisors is an integer number (10583118).

Almost surely, 2^42206891 is an apocalyptic number.

42206891 is a deficient number, since it is larger than the sum of its proper divisors (125581).

42206891 is a wasteful number, since it uses less digits than its factorization.

42206891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125580.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 42206891 is about 6496.6830767708. The cubic root of 42206891 is about 348.1724906766.

It can be divided in two parts, 4220 and 6891, that added together give a palindrome (11111).

The spelling of 42206891 in words is "forty-two million, two hundred six thousand, eight hundred ninety-one".