253443136 has 14 divisors (see below), whose sum is σ = 502926350. Its totient is φ = 126721536.

The previous prime is 253443133. The next prime is 253443137. The reversal of 253443136 is 631344352.

It can be written as a sum of positive squares in only one way, i.e., 247873536 + 5569600 = 15744^2 + 2360^2 .

It is a junction number, because it is equal to n+sod(n) for n = 253443098 and 253443107.

It is not an unprimeable number, because it can be changed into a prime (253443133) by changing a digit.

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, 1979961 + ... + 1980088.

Almost surely, 2^253443136 is an apocalyptic number.

It is an amenable number.

253443136 is a deficient number, since it is larger than the sum of its proper divisors (249483214).

253443136 is an equidigital number, since it uses as much as digits as its factorization.

253443136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3960061 (or 3960051 counting only the distinct ones).

The product of its digits is 25920, while the sum is 31.

The square root of 253443136 is about 15919.8974871071. The cubic root of 253443136 is about 632.8394016519.

Adding to 253443136 its reverse (631344352), we get a palindrome (884787488).

The spelling of 253443136 in words is "two hundred fifty-three million, four hundred forty-three thousand, one hundred thirty-six".