253636 has 6 divisors (see below), whose sum is σ = 443870. Its totient is φ = 126816.

The previous prime is 253633. The next prime is 253637. The reversal of 253636 is 636352.

It can be written as a sum of positive squares in only one way, i.e., 160000 + 93636 = 400^2 + 306^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 253636.

It is not an unprimeable number, because it can be changed into a prime (253633) 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 as a sum of consecutive naturals, namely, 31701 + ... + 31708.

2²⁵³⁶³⁶ is an apocalyptic number.

It is an amenable number.

253636 is a deficient number, since it is larger than the sum of its proper divisors (190234).

253636 is a wasteful number, since it uses less digits than its factorization.

253636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63413 (or 63411 counting only the distinct ones).

The product of its digits is 3240, while the sum is 25.

The square root of 253636 is about 503.6228747783. The cubic root of 253636 is about 63.2999886030.

Adding to 253636 its reverse (636352), we get a palindrome (889988).

The spelling of 253636 in words is "two hundred fifty-three thousand, six hundred thirty-six".