253816 has 8 divisors (see below), whose sum is σ = 475920. Its totient is φ = 126904.

The previous prime is 253811. The next prime is 253819. The reversal of 253816 is 618352.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253811) by changing a digit.

253816 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15856 + ... + 15871.

It is an arithmetic number, because the mean of its divisors is an integer number (59490).

2²⁵³⁸¹⁶ is an apocalyptic number.

It is an amenable number.

253816 is a deficient number, since it is larger than the sum of its proper divisors (222104).

253816 is a wasteful number, since it uses less digits than its factorization.

253816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31733 (or 31729 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 253816 is about 503.8015482310. The cubic root of 253816 is about 63.3149592744.

The spelling of 253816 in words is "two hundred fifty-three thousand, eight hundred sixteen".