421870018 has 16 divisors (see below), whose sum is σ = 657363960. Its totient is φ = 202809600.

The previous prime is 421869949. The next prime is 421870021. The reversal of 421870018 is 810078124.

It can be written as a sum of positive squares in 4 ways, for example, as 391762849 + 30107169 = 19793^2 + 5487^2 .

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 7 ways as a sum of consecutive naturals, for example, 1113 + ... + 29068.

Almost surely, 2^421870018 is an apocalyptic number.

421870018 is a deficient number, since it is larger than the sum of its proper divisors (235493942).

421870018 is a wasteful number, since it uses less digits than its factorization.

421870018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30453.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 421870018 is about 20539.4746281398. The cubic root of 421870018 is about 749.9970476921.

The spelling of 421870018 in words is "four hundred twenty-one million, eight hundred seventy thousand, eighteen".