423989281 has 9 divisors (see below), whose sum is σ = 432536691.
Its totient is φ = 415608744.
The previous prime is 423989261. The next prime is 423989297. The reversal of 423989281 is 182989324.
The square root of 423989281 is 20591.
It is a perfect power (a square), and thus also a powerful number.
It can be written as a sum of positive squares in only one way, i.e., 311204881 + 112784400 = 17641^2 + 10620^2
It is not a de Polignac number, because 423989281 - 215 = 423956513 is a prime.
It is a super-2 number, since 2×4239892812 = 359533820805793922, which contains 22 as substring.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (423989261) by changing a digit.
It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1214695 + ... + 1215043.
Almost surely, 2423989281 is an apocalyptic number.
423989281 is the 20591-st square number.
423989281 is the 10296-th centered octagonal number.
It is an amenable number.
423989281 is a deficient number, since it is larger than the sum of its proper divisors (8547410).
423989281 is an frugal number, since it uses more digits than its factorization.
423989281 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 816 (or 408 counting only the distinct ones).
The product of its digits is 248832, while the sum is 46.
The cubic root of 423989281 is about 751.2508200319.
The spelling of 423989281 in words is "four hundred twenty-three million, nine hundred eighty-nine thousand, two hundred eighty-one".