1263126320 has 40 divisors (see below), whose sum is σ = 3038042160. Its totient is φ = 487827200.

The previous prime is 1263126311. The next prime is 1263126323. The reversal of 1263126320 is 236213621.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1263126320.

It is not an unprimeable number, because it can be changed into a prime (1263126323) 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, 269906 + ... + 274545.

It is an arithmetic number, because the mean of its divisors is an integer number (75951054).

Almost surely, 2^1263126320 is an apocalyptic number.

1263126320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1263126320 is an abundant number, since it is smaller than the sum of its proper divisors (1774915840).

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

1263126320 is a wasteful number, since it uses less digits than its factorization.

1263126320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544493 (or 544487 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 1263126320 is about 35540.4884603462. The cubic root of 1263126320 is about 1080.9748628016.

Adding to 1263126320 its reverse (236213621), we get a palindrome (1499339941).

The spelling of 1263126320 in words is "one billion, two hundred sixty-three million, one hundred twenty-six thousand, three hundred twenty".