1263212379 has 24 divisors (see below), whose sum is σ = 2143635312. Its totient is φ = 706691520.

The previous prime is 1263212351. The next prime is 1263212381. The reversal of 1263212379 is 9732123621.

1263212379 is a `hidden beast` number, since 1 + 2 + 632 + 12 + 3 + 7 + 9 = 666.

It is not a de Polignac number, because 1263212379 - 2¹⁷ = 1263081307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1263212309) by changing a digit.

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, 489472 + ... + 492045.

It is an arithmetic number, because the mean of its divisors is an integer number (89318138).

Almost surely, 2^1263212379 is an apocalyptic number.

1263212379 is a deficient number, since it is larger than the sum of its proper divisors (880422933).

1263212379 is a wasteful number, since it uses less digits than its factorization.

1263212379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981547 (or 981544 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 1263212379 is about 35541.6991574685. The cubic root of 1263212379 is about 1080.9994118119. Note that the first 3 decimals are identical.

The spelling of 1263212379 in words is "one billion, two hundred sixty-three million, two hundred twelve thousand, three hundred seventy-nine".