1261138 has 8 divisors (see below), whose sum is σ = 1897740. Its totient is φ = 628560.

The previous prime is 1261133. The next prime is 1261157. The reversal of 1261138 is 8311621.

It can be written as a sum of positive squares in 2 ways, for example, as 1261129 + 9 = 1123^2 + 3^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1261133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33 + ... + 1588.

2^1261138 is an apocalyptic number.

1261138 is a deficient number, since it is larger than the sum of its proper divisors (636602).

1261138 is a wasteful number, since it uses less digits than its factorization.

1261138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2012.

The product of its digits is 288, while the sum is 22.

The square root of 1261138 is about 1123.0040071166. The cubic root of 1261138 is about 108.0407368044.

Adding to 1261138 its reverse (8311621), we get a palindrome (9572759).

The spelling of 1261138 in words is "one million, two hundred sixty-one thousand, one hundred thirty-eight".