489999421 has 4 divisors (see below), whose sum is σ = 490088412. Its totient is φ = 489910432.

The previous prime is 489999413. The next prime is 489999431. The reversal of 489999421 is 124999984.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 349316100 + 140683321 = 18690^2 + 11861^2 .

It is a cyclic number.

It is not a de Polignac number, because 489999421 - 2³ = 489999413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (489999431) 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, 35650 + ... + 47443.

It is an arithmetic number, because the mean of its divisors is an integer number (122522103).

Almost surely, 2^489999421 is an apocalyptic number.

It is an amenable number.

489999421 is a deficient number, since it is larger than the sum of its proper divisors (88991).

489999421 is an equidigital number, since it uses as much as digits as its factorization.

489999421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88990.

The product of its digits is 1679616, while the sum is 55.

The square root of 489999421 is about 22135.9305428979. The cubic root of 489999421 is about 788.3732057878.

It can be divided in two parts, 4899994 and 21, that added together give a triangular number (4900015 = T₃₁₃₀).

The spelling of 489999421 in words is "four hundred eighty-nine million, nine hundred ninety-nine thousand, four hundred twenty-one".