253235440 has 40 divisors (see below), whose sum is σ = 591890688. Its totient is φ = 100757760.

The previous prime is 253235429. The next prime is 253235441. The reversal of 253235440 is 44532352.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 253235399 and 253235408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253235441) 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 in 7 ways as a sum of consecutive naturals, for example, 6994 + ... + 23566.

Almost surely, 2^253235440 is an apocalyptic number.

253235440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

253235440 is an abundant number, since it is smaller than the sum of its proper divisors (338655248).

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

253235440 is a wasteful number, since it uses less digits than its factorization.

253235440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16777 (or 16771 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 28.

The square root of 253235440 is about 15913.3729925494. The cubic root of 253235440 is about 632.6664843192. Note that the first 3 decimals are identical.

Adding to 253235440 its reverse (44532352), we get a palindrome (297767792).

The spelling of 253235440 in words is "two hundred fifty-three million, two hundred thirty-five thousand, four hundred forty".