1261707238 has 12 divisors (see below), whose sum is σ = 2064884508. Its totient is φ = 573427560.

The previous prime is 1261707203. The next prime is 1261707257. The reversal of 1261707238 is 8327071621.

It is a junction number, because it is equal to n+sod(n) for n = 1261707197 and 1261707206.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 162820 + ... + 170392.

It is an arithmetic number, because the mean of its divisors is an integer number (172073709).

Almost surely, 2^1261707238 is an apocalyptic number.

1261707238 is a deficient number, since it is larger than the sum of its proper divisors (803177270).

1261707238 is an frugal number, since it uses more digits than its factorization.

1261707238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15159 (or 7586 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 1261707238 is about 35520.5185491428. The cubic root of 1261707238 is about 1080.5698975529.

Adding to 1261707238 its reverse (8327071621), we get a palindrome (9588778859).

The spelling of 1261707238 in words is "one billion, two hundred sixty-one million, seven hundred seven thousand, two hundred thirty-eight".