1261983412 has 24 divisors (see below), whose sum is σ = 2336072256. Its totient is φ = 595286208.

The previous prime is 1261983407. The next prime is 1261983419. The reversal of 1261983412 is 2143891621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261983419) 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, 87238 + ... + 100669.

It is an arithmetic number, because the mean of its divisors is an integer number (97336344).

Almost surely, 2^1261983412 is an apocalyptic number.

It is an amenable number.

1261983412 is a deficient number, since it is larger than the sum of its proper divisors (1074088844).

1261983412 is a wasteful number, since it uses less digits than its factorization.

1261983412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188007 (or 188005 counting only the distinct ones).

The product of its digits is 20736, while the sum is 37.

The square root of 1261983412 is about 35524.4058641380. The cubic root of 1261983412 is about 1080.6487334695.

The spelling of 1261983412 in words is "one billion, two hundred sixty-one million, nine hundred eighty-three thousand, four hundred twelve".