1263137920 has 256 divisors, whose sum is σ = 3569184000. Its totient is φ = 422625280.

The previous prime is 1263137867. The next prime is 1263137921. The reversal of 1263137920 is 297313621.

It is not an unprimeable number, because it can be changed into a prime (1263137921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4695546 + ... + 4695814.

It is an arithmetic number, because the mean of its divisors is an integer number (13942125).

Almost surely, 2^1263137920 is an apocalyptic number.

1263137920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1263137920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1784592000).

1263137920 is an abundant number, since it is smaller than the sum of its proper divisors (2306046080).

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

1263137920 is a wasteful number, since it uses less digits than its factorization.

1263137920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351 (or 339 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 1263137920 is about 35540.6516541270. The cubic root of 1263137920 is about 1080.9781718583.

The spelling of 1263137920 in words is "one billion, two hundred sixty-three million, one hundred thirty-seven thousand, nine hundred twenty".