253136440 has 16 divisors (see below), whose sum is σ = 569557080. Its totient is φ = 101254560.

The previous prime is 253136437. The next prime is 253136441. The reversal of 253136440 is 44631352.

253136440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 253136399 and 253136408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253136441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3164166 + ... + 3164245.

Almost surely, 2^253136440 is an apocalyptic number.

253136440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

253136440 is an abundant number, since it is smaller than the sum of its proper divisors (316420640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

253136440 is a wasteful number, since it uses less digits than its factorization.

253136440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6328422 (or 6328418 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 253136440 is about 15910.2620971498. The cubic root of 253136440 is about 632.5840285806.

Adding to 253136440 its reverse (44631352), we get a palindrome (297767792).

The spelling of 253136440 in words is "two hundred fifty-three million, one hundred thirty-six thousand, four hundred forty".