1261234439 has 8 divisors (see below), whose sum is σ = 1270268160. Its totient is φ = 1252233216.

The previous prime is 1261234433. The next prime is 1261234453. The reversal of 1261234439 is 9344321621.

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 1261234439 - 2¹² = 1261230343 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1261234399 and 1261234408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261234433) 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, 72602 + ... + 88280.

It is an arithmetic number, because the mean of its divisors is an integer number (158783520).

Almost surely, 2^1261234439 is an apocalyptic number.

1261234439 is a deficient number, since it is larger than the sum of its proper divisors (9033721).

1261234439 is a wasteful number, since it uses less digits than its factorization.

1261234439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16249.

The product of its digits is 31104, while the sum is 35.

The square root of 1261234439 is about 35513.8626313726. The cubic root of 1261234439 is about 1080.4349068619.

The spelling of 1261234439 in words is "one billion, two hundred sixty-one million, two hundred thirty-four thousand, four hundred thirty-nine".