11881658 has 4 divisors (see below), whose sum is σ = 17822490. Its totient is φ = 5940828.

The previous prime is 11881591. The next prime is 11881673. The reversal of 11881658 is 85618811.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10543009 + 1338649 = 3247^2 + 1157^2 .

It is a Curzon number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2970413 + ... + 2970416.

Almost surely, 2^11881658 is an apocalyptic number.

11881658 is a deficient number, since it is larger than the sum of its proper divisors (5940832).

11881658 is an equidigital number, since it uses as much as digits as its factorization.

11881658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5940831.

The product of its digits is 15360, while the sum is 38.

The square root of 11881658 is about 3446.9780968263. The cubic root of 11881658 is about 228.1877621270.

It can be divided in two parts, 118816 and 58, that multiplied together give a triangular number (6891328 = T₃₇₁₂).

The spelling of 11881658 in words is "eleven million, eight hundred eighty-one thousand, six hundred fifty-eight".