421018 has 8 divisors (see below), whose sum is σ = 680148. Its totient is φ = 194304.

The previous prime is 421009. The next prime is 421019. The reversal of 421018 is 810124.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 413449 + 7569 = 643^2 + 87^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 420992 and 421010.

It is not an unprimeable number, because it can be changed into a prime (421019) 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, 8071 + ... + 8122.

2⁴²¹⁰¹⁸ is an apocalyptic number.

421018 is a deficient number, since it is larger than the sum of its proper divisors (259130).

421018 is a wasteful number, since it uses less digits than its factorization.

421018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16208.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 421018 is about 648.8589985505. The cubic root of 421018 is about 74.9491803875.

The spelling of 421018 in words is "four hundred twenty-one thousand, eighteen".