421731879 has 8 divisors (see below), whose sum is σ = 562528752. Its totient is φ = 281044800.

The previous prime is 421731853. The next prime is 421731901. The reversal of 421731879 is 978137124.

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

It is not a de Polignac number, because 421731879 - 2⁸ = 421731623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 421731879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421731829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18022 + ... + 34179.

It is an arithmetic number, because the mean of its divisors is an integer number (70316094).

Almost surely, 2^421731879 is an apocalyptic number.

421731879 is a deficient number, since it is larger than the sum of its proper divisors (140796873).

421731879 is a wasteful number, since it uses less digits than its factorization.

421731879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54897.

The product of its digits is 84672, while the sum is 42.

The square root of 421731879 is about 20536.1115842313. Note that the first 3 decimals coincide. The cubic root of 421731879 is about 749.9151779629.

The spelling of 421731879 in words is "four hundred twenty-one million, seven hundred thirty-one thousand, eight hundred seventy-nine".