421731878 has 8 divisors (see below), whose sum is σ = 633121272. Its totient is φ = 210691456.

The previous prime is 421731853. The next prime is 421731901. The reversal of 421731878 is 878137124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84200 + ... + 89067.

It is an arithmetic number, because the mean of its divisors is an integer number (79140159).

Almost surely, 2^421731878 is an apocalyptic number.

421731878 is a deficient number, since it is larger than the sum of its proper divisors (211389394).

421731878 is a wasteful number, since it uses less digits than its factorization.

421731878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174486.

The product of its digits is 75264, while the sum is 41.

The square root of 421731878 is about 20536.1115598840. Note that the first 3 decimals coincide. The cubic root of 421731878 is about 749.9151773702.

The spelling of 421731878 in words is "four hundred twenty-one million, seven hundred thirty-one thousand, eight hundred seventy-eight".