490209421 has 16 divisors (see below), whose sum is σ = 533454768. Its totient is φ = 447782400.

The previous prime is 490209409. The next prime is 490209431. The reversal of 490209421 is 124902094.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 114276100 + 375933321 = 10690^2 + 19389^2 .

It is a de Polignac number, because none of the positive numbers 2^k-490209421 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 (490209431) 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 15 ways as a sum of consecutive naturals, for example, 940641 + ... + 941161.

It is an arithmetic number, because the mean of its divisors is an integer number (33340923).

Almost surely, 2^490209421 is an apocalyptic number.

It is an amenable number.

490209421 is a deficient number, since it is larger than the sum of its proper divisors (43245347).

490209421 is a wasteful number, since it uses less digits than its factorization.

490209421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1152.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 490209421 is about 22140.6734540754. The cubic root of 490209421 is about 788.4858145791.

The spelling of 490209421 in words is "four hundred ninety million, two hundred nine thousand, four hundred twenty-one".