253640436 has 24 divisors (see below), whose sum is σ = 676374720. Its totient is φ = 72468672.

The previous prime is 253640417. The next prime is 253640437. The reversal of 253640436 is 634046352.

It is a junction number, because it is equal to n+sod(n) for n = 253640397 and 253640406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253640437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1509681 + ... + 1509848.

It is an arithmetic number, because the mean of its divisors is an integer number (28182280).

Almost surely, 2^253640436 is an apocalyptic number.

It is an amenable number.

253640436 is an abundant number, since it is smaller than the sum of its proper divisors (422734284).

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

253640436 is a wasteful number, since it uses less digits than its factorization.

253640436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3019543 (or 3019541 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 33.

The square root of 253640436 is about 15926.0929295292. The cubic root of 253640436 is about 633.0035763195.

Adding to 253640436 its reverse (634046352), we get a palindrome (887686788).

The spelling of 253640436 in words is "two hundred fifty-three million, six hundred forty thousand, four hundred thirty-six".