253805 has 8 divisors (see below), whose sum is σ = 317952. Its totient is φ = 194128.

The previous prime is 253801. The next prime is 253811. The reversal of 253805 is 508352.

253805 is nontrivially palindromic in base 15.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 253805 - 2² = 253801 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 989 + ... + 1218.

It is an arithmetic number, because the mean of its divisors is an integer number (39744).

2²⁵³⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

253805 is a deficient number, since it is larger than the sum of its proper divisors (64147).

253805 is a wasteful number, since it uses less digits than its factorization.

253805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2235.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 253805 is about 503.7906311157. The cubic root of 253805 is about 63.3140446031.

Adding to 253805 its sum of digits (23), we get a triangular number (253828 = T₇₁₂).

The spelling of 253805 in words is "two hundred fifty-three thousand, eight hundred five".