290421 has 18 divisors (see below), whose sum is σ = 445718. Its totient is φ = 182160.

The previous prime is 290419. The next prime is 290429. The reversal of 290421 is 124092.

It can be written as a sum of positive squares in only one way, i.e., 171396 + 119025 = 414^2 + 345^2 .

It is not a de Polignac number, because 290421 - 2¹ = 290419 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 290394 and 290403.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 290421.

It is not an unprimeable number, because it can be changed into a prime (290429) 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 17 ways as a sum of consecutive naturals, for example, 4731 + ... + 4791.

2²⁹⁰⁴²¹ is an apocalyptic number.

It is an amenable number.

290421 is a deficient number, since it is larger than the sum of its proper divisors (155297).

290421 is a wasteful number, since it uses less digits than its factorization.

290421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 290421 is about 538.9072276376. The cubic root of 290421 is about 66.2230743792.

The spelling of 290421 in words is "two hundred ninety thousand, four hundred twenty-one".