1253823636 has 48 divisors (see below), whose sum is σ = 3163910400. Its totient is φ = 384166272.

The previous prime is 1253823619. The next prime is 1253823643. The reversal of 1253823636 is 6363283521.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 1253823594 and 1253823603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20470 + ... + 54098.

It is an arithmetic number, because the mean of its divisors is an integer number (65914800).

Almost surely, 2^1253823636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1253823636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1581955200).

1253823636 is an abundant number, since it is smaller than the sum of its proper divisors (1910086764).

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

1253823636 is a wasteful number, since it uses less digits than its factorization.

1253823636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33888 (or 33886 counting only the distinct ones).

The product of its digits is 155520, while the sum is 39.

The square root of 1253823636 is about 35409.3721491924. The cubic root of 1253823636 is about 1078.3145968496.

The spelling of 1253823636 in words is "one billion, two hundred fifty-three million, eight hundred twenty-three thousand, six hundred thirty-six".