1253663436 has 96 divisors (see below), whose sum is σ = 3222761472. Its totient is φ = 377579520.

The previous prime is 1253663423. The next prime is 1253663441. The reversal of 1253663436 is 6343663521.

It is a junction number, because it is equal to n+sod(n) for n = 1253663394 and 1253663403.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 865665 + ... + 867111.

It is an arithmetic number, because the mean of its divisors is an integer number (33570432).

Almost surely, 2^1253663436 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 1253663436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1611380736).

1253663436 is an abundant number, since it is smaller than the sum of its proper divisors (1969098036).

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

1253663436 is a wasteful number, since it uses less digits than its factorization.

1253663436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1639 (or 1637 counting only the distinct ones).

The product of its digits is 233280, while the sum is 39.

The square root of 1253663436 is about 35407.1099639606. The cubic root of 1253663436 is about 1078.2686697747.

The spelling of 1253663436 in words is "one billion, two hundred fifty-three million, six hundred sixty-three thousand, four hundred thirty-six".