254405 has 16 divisors (see below), whose sum is σ = 335664. Its totient is φ = 184320.

The previous prime is 254389. The next prime is 254407. The reversal of 254405 is 504452.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 7396 + 247009 = 86^2 + 497^2 .

It is not a de Polignac number, because 254405 - 2⁴ = 254389 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (254407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3449 + ... + 3521.

It is an arithmetic number, because the mean of its divisors is an integer number (20979).

2²⁵⁴⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

254405 is a deficient number, since it is larger than the sum of its proper divisors (81259).

254405 is a wasteful number, since it uses less digits than its factorization.

254405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136.

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 254405 is about 504.3857650648. The cubic root of 254405 is about 63.3638972208.

Adding to 254405 its reverse (504452), we get a palindrome (758857).

Subtracting 254405 from its reverse (504452), we obtain a cube (250047 = 63³).

The spelling of 254405 in words is "two hundred fifty-four thousand, four hundred five".