421604089 has 3 divisors (see below), whose sum is σ = 421624623. Its totient is φ = 421583556.

The previous prime is 421604083. The next prime is 421604111. The reversal of 421604089 is 980406124.

The square root of 421604089 is 20533.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 289170025 + 132434064 = 17005^2 + 11508^2 .

It is not a de Polignac number, because 421604089 - 2³ = 421604081 is a prime.

It is a super-3 number, since 3×421604089³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421604081) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 10267 + ... + 30799.

It is an arithmetic number, because the mean of its divisors is an integer number (140541541).

Almost surely, 2^421604089 is an apocalyptic number.

421604089 is the 20533-rd square number.

421604089 is the 10267-th centered octagonal number.

It is an amenable number.

421604089 is a deficient number, since it is larger than the sum of its proper divisors (20534).

421604089 is an frugal number, since it uses more digits than its factorization.

421604089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41066 (or 20533 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The cubic root of 421604089 is about 749.8394257718.

The spelling of 421604089 in words is "four hundred twenty-one million, six hundred four thousand, eighty-nine".