1263139797 has 8 divisors (see below), whose sum is σ = 1783256256. Its totient is φ = 792558272.

The previous prime is 1263139751. The next prime is 1263139847. The reversal of 1263139797 is 7979313621.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1263139797 - 2¹² = 1263135701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263134797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12383673 + ... + 12383774.

It is an arithmetic number, because the mean of its divisors is an integer number (222907032).

Almost surely, 2^1263139797 is an apocalyptic number.

1263139797 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1263139797 is a deficient number, since it is larger than the sum of its proper divisors (520116459).

1263139797 is a wasteful number, since it uses less digits than its factorization.

1263139797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24767467.

The product of its digits is 428652, while the sum is 48.

The square root of 1263139797 is about 35540.6780604985. The cubic root of 1263139797 is about 1080.9787072960.

The spelling of 1263139797 in words is "one billion, two hundred sixty-three million, one hundred thirty-nine thousand, seven hundred ninety-seven".