421668516 has 24 divisors (see below), whose sum is σ = 1000571040. Its totient is φ = 138173632.

The previous prime is 421668461. The next prime is 421668517. The reversal of 421668516 is 615866124.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (421668517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 297081 + ... + 298496.

It is an arithmetic number, because the mean of its divisors is an integer number (41690460).

Almost surely, 2^421668516 is an apocalyptic number.

It is an amenable number.

421668516 is an abundant number, since it is smaller than the sum of its proper divisors (578902524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421668516 is a wasteful number, since it uses less digits than its factorization.

421668516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595643 (or 595641 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 421668516 is about 20534.5688048228. The cubic root of 421668516 is about 749.8776191428.

The spelling of 421668516 in words is "four hundred twenty-one million, six hundred sixty-eight thousand, five hundred sixteen".