11991412 has 6 divisors (see below), whose sum is σ = 20984978. Its totient is φ = 5995704.

The previous prime is 11991407. The next prime is 11991433. The reversal of 11991412 is 21419911.

It can be written as a sum of positive squares in only one way, i.e., 9759376 + 2232036 = 3124^2 + 1494^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1498923 + ... + 1498930.

Almost surely, 2^11991412 is an apocalyptic number.

It is an amenable number.

11991412 is a deficient number, since it is larger than the sum of its proper divisors (8993566).

11991412 is a wasteful number, since it uses less digits than its factorization.

11991412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2997857 (or 2997855 counting only the distinct ones).

The product of its digits is 648, while the sum is 28.

The square root of 11991412 is about 3462.8618222505. The cubic root of 11991412 is about 228.8882198882. Note that the first 3 decimals are identical.

It can be divided in two parts, 11991 and 412, that added together give a triangular number (12403 = T₁₅₇).

The spelling of 11991412 in words is "eleven million, nine hundred ninety-one thousand, four hundred twelve".