421279018 has 16 divisors (see below), whose sum is σ = 647937864. Its totient is φ = 205309440.

The previous prime is 421278983. The next prime is 421279069. The reversal of 421279018 is 810972124.

It can be written as a sum of positive squares in 4 ways, for example, as 286184889 + 135094129 = 16917^2 + 11623^2 .

It is a super-2 number, since 2×421279018² = 354952022014088648, which contains 22 as substring.

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, 129346 + ... + 132562.

Almost surely, 2^421279018 is an apocalyptic number.

421279018 is a deficient number, since it is larger than the sum of its proper divisors (226658846).

421279018 is a wasteful number, since it uses less digits than its factorization.

421279018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4857.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 421279018 is about 20525.0826551320. The cubic root of 421279018 is about 749.6466590412.

The spelling of 421279018 in words is "four hundred twenty-one million, two hundred seventy-nine thousand, eighteen".