1261923338 has 36 divisors (see below), whose sum is σ = 2101849794. Its totient is φ = 567964800.

The previous prime is 1261923331. The next prime is 1261923347. The reversal of 1261923338 is 8333291621.

It can be written as a sum of positive squares in 9 ways, for example, as 259757689 + 1002165649 = 16117^2 + 31657^2 .

It is not an unprimeable number, because it can be changed into a prime (1261923331) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 567068 + ... + 569288.

Almost surely, 2^1261923338 is an apocalyptic number.

1261923338 is a deficient number, since it is larger than the sum of its proper divisors (839926456).

1261923338 is a wasteful number, since it uses less digits than its factorization.

1261923338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2331 (or 2277 counting only the distinct ones).

The product of its digits is 46656, while the sum is 38.

The square root of 1261923338 is about 35523.5603226929. The cubic root of 1261923338 is about 1080.6315858795.

The spelling of 1261923338 in words is "one billion, two hundred sixty-one million, nine hundred twenty-three thousand, three hundred thirty-eight".