11981386 has 4 divisors (see below), whose sum is σ = 17972082. Its totient is φ = 5990692.

The previous prime is 11981363. The next prime is 11981393. The reversal of 11981386 is 68318911.

11981386 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.

It can be written as a sum of positive squares in only one way, i.e., 7700625 + 4280761 = 2775^2 + 2069^2 .

It is a super-2 number, since 2×11981386² = 287107220961992, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2995345 + ... + 2995348.

Almost surely, 2^11981386 is an apocalyptic number.

11981386 is a deficient number, since it is larger than the sum of its proper divisors (5990696).

11981386 is an equidigital number, since it uses as much as digits as its factorization.

11981386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5990695.

The product of its digits is 10368, while the sum is 37.

The square root of 11981386 is about 3461.4138729716. The cubic root of 11981386 is about 228.8244110791.

The spelling of 11981386 in words is "eleven million, nine hundred eighty-one thousand, three hundred eighty-six".