11961138 has 64 divisors (see below), whose sum is σ = 28892160. Its totient is φ = 3229632.

The previous prime is 11961121. The next prime is 11961143. The reversal of 11961138 is 83116911.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 66733 + ... + 66911.

It is an arithmetic number, because the mean of its divisors is an integer number (451440).

Almost surely, 2^11961138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11961138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14446080).

11961138 is an abundant number, since it is smaller than the sum of its proper divisors (16931022).

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

11961138 is a wasteful number, since it uses less digits than its factorization.

11961138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271.

The product of its digits is 1296, while the sum is 30.

The square root of 11961138 is about 3458.4878198427. The cubic root of 11961138 is about 228.6954374329.

The spelling of 11961138 in words is "eleven million, nine hundred sixty-one thousand, one hundred thirty-eight".