11661838 has 4 divisors (see below), whose sum is σ = 17492760. Its totient is φ = 5830918.

The previous prime is 11661833. The next prime is 11661841. The reversal of 11661838 is 83816611.

11661838 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83816611 = 199 ⋅421189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11661833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2915458 + ... + 2915461.

It is an arithmetic number, because the mean of its divisors is an integer number (4373190).

Almost surely, 2^11661838 is an apocalyptic number.

11661838 is a deficient number, since it is larger than the sum of its proper divisors (5830922).

11661838 is an equidigital number, since it uses as much as digits as its factorization.

11661838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5830921.

The product of its digits is 6912, while the sum is 34.

The square root of 11661838 is about 3414.9433377437. The cubic root of 11661838 is about 226.7717760303.

The spelling of 11661838 in words is "eleven million, six hundred sixty-one thousand, eight hundred thirty-eight".