11661738 has 24 divisors (see below), whose sum is σ = 25638144. Its totient is φ = 3533640.

The previous prime is 11661709. The next prime is 11661739. The reversal of 11661738 is 83716611.

It is a super-2 number, since 2×11661738² = 271992266361288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11661699 and 11661708.

It is not an unprimeable number, because it can be changed into a prime (11661739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7306 + ... + 8757.

It is an arithmetic number, because the mean of its divisors is an integer number (1068256).

Almost surely, 2^11661738 is an apocalyptic number.

11661738 is an abundant number, since it is smaller than the sum of its proper divisors (13976406).

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

11661738 is a wasteful number, since it uses less digits than its factorization.

11661738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16090 (or 16079 counting only the distinct ones).

The product of its digits is 6048, while the sum is 33.

The square root of 11661738 is about 3414.9286961809. The cubic root of 11661738 is about 226.7711278408.

The spelling of 11661738 in words is "eleven million, six hundred sixty-one thousand, seven hundred thirty-eight".