1245643518 has 48 divisors (see below), whose sum is σ = 2899532160. Its totient is φ = 349372512.

The previous prime is 1245643493. The next prime is 1245643523. The reversal of 1245643518 is 8153465421.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1756548 + ... + 1757256.

It is an arithmetic number, because the mean of its divisors is an integer number (60406920).

Almost surely, 2^1245643518 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1245643518, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1449766080).

1245643518 is an abundant number, since it is smaller than the sum of its proper divisors (1653888642).

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

1245643518 is an frugal number, since it uses more digits than its factorization.

1245643518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1489 (or 780 counting only the distinct ones).

The product of its digits is 115200, while the sum is 39.

The square root of 1245643518 is about 35293.6753257577. The cubic root of 1245643518 is about 1075.9644542414.

The spelling of 1245643518 in words is "one billion, two hundred forty-five million, six hundred forty-three thousand, five hundred eighteen".