1261243412 has 48 divisors (see below), whose sum is σ = 2596551552. Its totient is φ = 528478080.

The previous prime is 1261243397. The next prime is 1261243439. The reversal of 1261243412 is 2143421621.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 781118 + ... + 782730.

It is an arithmetic number, because the mean of its divisors is an integer number (54094824).

Almost surely, 2^1261243412 is an apocalyptic number.

It is an amenable number.

1261243412 is an abundant number, since it is smaller than the sum of its proper divisors (1335308140).

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

1261243412 is a wasteful number, since it uses less digits than its factorization.

1261243412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3008 (or 3006 counting only the distinct ones).

The product of its digits is 2304, while the sum is 26.

The square root of 1261243412 is about 35513.9889620977. The cubic root of 1261243412 is about 1080.4374690923.

The spelling of 1261243412 in words is "one billion, two hundred sixty-one million, two hundred forty-three thousand, four hundred twelve".