42278893 has 4 divisors (see below), whose sum is σ = 42346528. Its totient is φ = 42211260.

The previous prime is 42278879. The next prime is 42278909. The reversal of 42278893 is 39887224.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42278893 - 2²⁵ = 8724461 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 (42278833) 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, 32871 + ... + 34132.

It is an arithmetic number, because the mean of its divisors is an integer number (10586632).

Almost surely, 2^42278893 is an apocalyptic number.

It is an amenable number.

42278893 is a deficient number, since it is larger than the sum of its proper divisors (67635).

42278893 is an equidigital number, since it uses as much as digits as its factorization.

42278893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67634.

The product of its digits is 193536, while the sum is 43.

The square root of 42278893 is about 6502.2221586162. Note that the first 3 decimals coincide. The cubic root of 42278893 is about 348.3703641612.

The spelling of 42278893 in words is "forty-two million, two hundred seventy-eight thousand, eight hundred ninety-three".